Question

火星人用“克勒特”（clert）衡量角度。一个整圆有 $500$ 克勒特。一个直角有多少克勒特？

Martians measure angles in clerts. There are $500$ clerts in a full circle. How many clerts are there in a right angle?

$90$

$100$

$125$

$180$

$250$

直角是整圆的四分之一，所以它包含 $\dfrac14 \times 500 = 125$ 克勒特。

所以正确答案是 C。

A right angle is a quarter of a full circle, so it contains $\dfrac14 \times 500 = 125$ clerts.

Thus, the correct answer is C .