### Answer:

Let’s go to basics, what is sin(θ). Sin(θ) is the ration of opposite side to hypotenuse. In above figure B angle = 90°, now the opposite side is AC and even hypotenuse is AC. Sin(θ) = opposite/hypotenuse = AC/AC = 1.

It’s easy!

Let’s go to basics, what is sin(θ). Sin(θ) is the ration of opposite side to hypotenuse. In above figure B angle = 90°, now the opposite side is AC and even hypotenuse is AC. Sin(θ) = opposite/hypotenuse = AC/AC = 1.

It’s easy!