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

easy

In the figure shown, triangle $CAE$ is similar to triangle $CBD$. The measure of angle $CBD$ is $57^{\circ }$, and $AE=21(BD)$. What is the measure of angle $CAE$?

A

$(21\cdot 57{)}^{\circ }$

B

$(21+57{)}^{\circ }$

C

$57^{\circ }$

D

$21^{\circ }$