Question

if Sin a=3/5 then Cos a=​

Answer 1

Using Pythagorean’s theorem ,

We know SinA=opp.to theta/Hypotenuse which means for adjacent use the formula that means you get 4=adjacent to theta

And we already know that cosA is equal to adjacent to theta/hypotenuse =4/5

Therefore cosA =4/5

Please mark BRAINLIEST

Answer 2

Step-by-step explanation:

sin A =opp/hyp

=3/5

cos A = adj/hyp

By. P.T

AB=BC+AC

BC=AB-AC

BC²=AB²-AC²

BC²=3²-5²

BC²=9-25

BC²=√16

BC=4

COS A= 4/5