The radius of the circle above is 39 mm. What is the circumference of the circle? (Use a = 3.14.)

244.92mm

Step-by-step explanation:

if we say circumference=2*pi*r then we have circumference=2*3.14*39=244.92

60°

Step-by-step explanation:

X + A = 180°

Y + B = 180°

Where X & Y are adjacent exterior angles to A & B respectively.

Therefore, A + B +C = 180°

X + Y + A + B = 360°

X + Y = 240°

Therefore, A + B = 120°

Since, A + B + C = 180°

So C = 60°