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Trigonometry

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Moderate

Unit Circle: Exact Value of the Sine of Angle 30 Degrees

TRIG-WDQBXE

Given that an angle is in a unit circle (radius is 1):
(See the unit circle below)

Find the exact value of $sin{ 30 }^{ o }$.

James Gunnin Created for Albert.io. Copyright 2016. All rights reserved

A

$2$

B

$\cfrac { 1 }{ 2 }$

C

$ \cfrac { \sqrt { 3 } }{ 2 }$

D

$ \cfrac { \sqrt { 2 } }{ 2 }$