Question

If sin angle A= 4/5 then what does cos angle A equal?

cos angle A= 5/8
cos angle A= 1/2
cos angle A= 4/5
cos angle A= 3/5

Answer 1

• cos angle A = ⅗

Explanation:

Here,

• sin A = ⅘
• sin A = P/H

Byy Using Pythagoras Theoram

`\sf \: ( AC)² = (BC)² + (AB)²`

→(5)² = (4)²+ AB²

→ 25 = 16 + AB²

→ 25-16 = AB²

→ 9 = AB²

→√9 = AB

→ 3 = AB

Now,

We know that

cos A = B/H

= 3/5

Thus,,

option d is correct answer