Weegy: The circumference of a circle with a diameter of 45 centimeters is circumference =2 *pi*r =3.14*45 = 141.4 cm.
User: If two angles are supplementary and one of them is 30°, what is the measurement of the second angle?
A. 60°
B. 150°
C. 90°
D. 180°
Weegy: If two angles are supplementary and one of them is 30°, the measurement of the second angle is 150°. [ supplementary angles sum =180 , one angle =30 , other angle =180-30 =150 ]
User: Find the perimeter of a regular octagon if one side has a measure of 8 cm.
A. 72 cm.
B. 16 cm.
C. 56 cm.
D. 64 cm.
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