Determine sin A and cos A, to the nearest tenth.?

sinA
= (opposite side) / hypotenuse
= BC / AC
= 10/25
= 0.4

cosA
= (adjacent side) / hypotenuse
= AB/AC
= 20/25
= 0.8

The answer: D. sinA = 0.4; cosA = 0.8

However, this question goes WRONG.
This is because a triangle with sides 10, 20 and 25 is NOT a right-angled triangle.

SOHCAHTOA

D. sin A = 0.4; cos A = 0.8

Sin(A) = 10/25 = 2/5 = 0.4
Cos(a) = 20/25 = 4/5 = 0.8

Ans: D