<span>The circumference of a circle is the length that the circle would occupy if it were opened and laid flat on a surface as a straight line. For this reason, when calculating the distance travelled in circular motion, the circumference is used. The cirumference is calculated using: C = 2*pi*radius</span>
Answer:
a = 60 degrees and b = 30 degrees
Step-by-step explanation:
30 degrees (line E) = angle b
angle b = 30 degrees
there is a right angle plus the 30 degrees = 120 degrees.
180 - 120 = 60 degrees which is angle a
