Question

△ABC内接于以O为圆心的圆，且∠AOB=60°．则∠C=______．

Answer 1

∵△ABC内接于以O为圆心的圆，
∴∠C=

1

2

∠AOB，
∵∠AOB=60°
∴∠C=

1

2

×60°=30°
故答案为30°．