MATHS - Geometry - Circle Theorems Part 1

This video tutorial introduces four circle theorems, each explained with examples. The first theorem states that the angle at the center of a circle is double the angle at the circumference. The second theorem explains that the angle in a semicircle is always 90 degrees. The third theorem describes that angles in the same segment are equal, and the fourth theorem covers cyclic quadrilaterals, where opposite angles sum to 180 degrees. The video concludes with a review and practice questions to reinforce learning.

What defines a cyclic quadrilateral in relation to a circle?

Can you list the four theorems discussed in the video?