In a , if , , and , then is equal…

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

In a

\triangle ABC

, if

a=13

b=14

, and

c=15

, then

\angle A

is equal to (1)

\sin^{-1}\!\left(\frac{4}{5}\right)

(2)

\sin^{-1}\!\left(\frac{3}{5}\right)

(3)

\sin^{-1}\!\left(\frac{3}{4}\right)

(4)

\sin^{-1}\!\left(\frac{2}{3}\right)