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I researched Reference and Conterminal angels.

Conterminal angels are angles with the same initial and terminal sides. However, the rotations could be different hence the co-terminal.

Reference angel is the smallest positive acute angle formed by terminal side of the angle t and horizontal x axis. (Blitzer, 2021)

Find the Reference angle of the following : I will find by adding or subtracting 360 from the given angle ,

=

Find the Conterminal angle of the following : I will find by adding and or subtracting

or

–

= +

, first you need a common denominator to add or subtract.

=

+=-=

Find the following refence and conterminal angels:

a.

b. 450

References

Blitzer, R. F. (2021). Precalculus (7th Edition). Pearson Education (US).