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
