Answer:
19
+ 76 mm
Explanation:
First, use the circumference formula to find the perimeter of the entire circle:
c = 2
r
c = 2
(38)
c = 76
Divide this by 4, since the question asks for the perimeter of the quarter circle:
76
/4
= 19
19
is the arc length section of the perimeter. The length of the other 2 sides of the perimeter, formed by the radius, can be found by doubling 38.
38(2) = 76
Add this to 19
:
19
+ 76
So, the expression is 19
+ 76 mm