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Mathematics
Brennen Maddox
30 March, 08:12
Use the circle unit to find sin 90 degrees
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Alina Howard
30 March, 11:25
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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
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