Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 3)
If an arc subtends an angle of 70 degrees at the center, what angle does it subtend at a point on the major arc?
35 degrees
70 degrees
140 degrees
210 degrees
Giải thích
The angle at the circumference (on the major arc) is half the angle at the center.