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Math·Geometry and Trigonometry·Lines, angles, and triangles

hard

The measure of angle $Z$ is $45^{\circ }$. What is the measure, in radians, of angle $Z$?

A

$\frac{1}{2}\pi$

B

$\frac{3}{4}\pi$

C

$\frac{1}{8}\pi$

D

$\frac{1}{4}\pi$