Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 25)
If a chord of a circle subtends an angle of 70 degrees at the center, what angle does it subtend at any point on the major arc?
35 degrees
70 degrees
140 degrees
17.5 degrees
Vysvětlení
The angle at the circumference (on the major arc) is half the angle at the center.