Question

Find the perimeter of this quarter circle with radius, r = 78mm. Give your answer as an expression in terms of π .

Answer 1

Circumfrence/Perimeter of a Circle
 = 2πr
 = (2)(π)(78)
 = (π)(156)
Divide by four to get Quarter Circle
 = (π)(156/4)
 = (π)(39)
The Circumfrence / Perimiter of this quarter circle in terms of π is 39π mm.