Question

Solve for A.
Picture is above.​

Answer 1

Use pythagora theorem for right triangles, a^2+b^2=c^2
So a^2 + 9^2 = 12^2
a^2+81=144
Subtract 81 from both sides
a^2=63
Now just take the square root of find a.
sqrt(63)=3sqrt7 or 7.94

Answer 2

Hope this will help u.plz mark my ans as brainliest.