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
คำอธิบาย
The angle at the circumference (on the major arc) is half the angle at the center.