Lesson
Lesson-4.1.14- Know and use angle properties of regular and irregular polygons. Includes exterior and interior angles, and angle sum.
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Lesson-4.1.13 - Calculate unknown angles and give geometric explanations for angles formed within parallel lines: ??? corresponding angles are equal ??? alternate angles are equal ??? co-interior (supplementary) angles sum to 180??.PreviousLesson-4.1.15- alculate unknown angles and give explanations using the following geometrical properties of circles: ??? angle in a semicircle = 90?? ??? angle between tangent and radius = 90?? ??? angle at the centre is twice the angle at the circumference ??? angles in the same segment are equal ??? opposite angles of a cyclic quadrilateral sum to 180?? (supplementary) ??? alternate segment theorem.Next