POLYGONS | O LEVELS (4024) & IGCSE (0580) | 2025 | Sir Arshad
This playlist consists of Sir Arshad's lecture on Polygons for the O Levels (4024) and IGCSE (0580) courses for 2025.
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𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg
𝟰 𝗚𝗲𝗼𝗺𝗲𝘁𝗿𝘆 𝟰.𝟲 𝗔𝗻𝗴𝗹𝗲𝘀 𝗡𝗼𝘁𝗲𝘀 𝗮𝗻𝗱 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀 1) Calculate unknown angles and Knowledge of three-letter notation for angles is give simple explanations using the required, e.g. angle ABC. Candidates are expected following geometrical properties: to use the correct geometrical terminology when • sum of angles at a point = 360° giving reasons for answers. • sum of angles at a point on a straight line = 180° • vertically opposite angles are equal • angle sum of a triangle = 180° and angle sum of a quadrilateral = 360°. 2) Calculate unknown angles and give geometric explanations for angles formed within parallel lines: • corresponding angles are equal • alternate angles are equal • co-interior angles sum to 180° (supplementary). 3) Know and use angle properties of Includes exterior and interior angles, and angle sum. reg