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Find the reference angle theta'for the f...

Find the reference angle `theta'`for the following angles in standerd position : (a)`theta=300^@" (b) "theta=2.3" (c ) " theta=-135^@`

Text Solution

Verified by Experts

The correct Answer is:
(a) `60^@" (b) "0.8416" (c ) " 45^@`
(a)
Because `300^@` lies in Quadrant IV, the acute angle it makes with the x-axis is `theta'=360^@-300^@=60^@`
)(b)
Because 2.3 lies between `pi//2~~1.5708" and "pi~~3.1416`, it follows that it is in Quadrant II and its reference angle is `theta'=pi-2.3~~0.8416`.
(c )
First, determine that`-135^@` is coterminal with `225^@`, which lies in Quadrant III. So, the reference angle is `theta'=225^@-180^@=45^@`.
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