He regular nonagon has rotational symmetry of which angle measures? check all that apply. 40° 45° 120° 240° 260° 320°

An nonagon is a regular shape of 9 sides with the same length.

As this has 9 sides, then the angle of rotational symmetry will be n*2π/9

where n is an integer.

writing it in degrees, the angles will have the for of n*360°/9

so the angles are:

n = 0 a = 0°

n = 1 a = 40°

n= 2 a = 80°

n= 3 a = 120°

..

and so on, adding by 40° each time.

so the answers are in the options that you give are 40°, 120°, 240°, 260° and 320°.

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step-by-step explanation: