Use the circle unit to find sin 90 degrees

Sin 90°=1

Step-by-step explanation:

A unit circle is a circle with a radius of 1. Because the radius is 1, it is possible to directly measure the sine, cosine and tangent.

using the unit circle where 90° is the limit as the hypotenuse approaches the vertical y-axis which is positive.

Sine=opposite/hypotenuse

Sin=O/H

Applying the limits

Sine 90°=1/1 = 1

cos 90° = 0/1 = 0

or

When the angle formed at the origin of the unit circle in the 1st quadrant is 0°, cos 0°=1 sin0°=0 and tan 0°=0

When we increase the angle until it is 90°, cos 90°=0, sin 90°=1 and tan 90°=undefined