Posted by **Hannah** on Tuesday, October 13, 2009 at 12:06am.

Determine two coterminal angles (one positive and one negative) for the given angle. Give your answers in radians.

a) 8pie/9 b)8pie/45

I know that you have to add 2pie but I do not know how to do that.

- math -
**MathMate**, Tuesday, October 13, 2009 at 7:34am
Coterminal angles for an angle α are angles of the form α±2kπ where k is different from zero.

For example, some coterminal angles of π/2 are:

π/2 - 4π = -(7/2)π

π/2 - 2π = -(3/2)π

π/2 + 2π = (3/2)π

π/2 + 4π = (7/2)π

- math - oops -
**MathMate**, Tuesday, October 13, 2009 at 7:35am
The last two should read:

π/2 + 2π = (5/2)π

π/2 + 4π = (9/2)π

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