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Math·Geometry and Trigonometry·Right triangles and trigonometry

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One angle is a right angle.
The length of the side opposite the right angle is $14$.
The lengths of the other $2$ sides are as follows:
$a$
$12$
Note: Figure not drawn to scale.

Which equation gives the relationship between the side lengths of the triangle shown?

A

$12^2+14^2=a^2$

B

$a^2+12^2=14^2$

C

$a+12=14$

D

$12+14=a$