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What is the perimeter of the figure to the nearest tenth of a millimeter?



A.
9.4 millimeters

B.
12.0 millimeters

C.
21.4 millimeters

D.
30.8 millimeters

Sagot :

perimiter is the distance around it

it can be split up into a rectangle and a semicircle

find the perimiter around the ractangle then the semicircle

so 2 sides are showing and 1 base so 3+3+6=12
rectangle total (not including part covered by semicircle because you don't include it) is 12


then semicircle

circumference=2 times pi times radius
2 times radius=diameter
diameter=6 because the base is 6 and that lines up with the diameter
so circumference=6 times pi
c=6pi

add
12+6pi=answer

the answer is 12+6π
(if you aprox pi to 3.14 then you would get an answer of 30.84)