Question

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

Answer 1

perimeter is the sum of all sides of a polygon, just add all the lengths of the sides :)

perimeter/circumference of a semi-circle: \( \pi r\)
perimeter of a rectangle: \(2l + 2w\)

perimeter of the figure: \( \pi r + 2l + 2w\)
where r=3mm (diameter of the semi-circle is 6, so radius is 3)
l= 6mm, w= 3mm

Answer 2

now what

Answer 3

substitute all your given values in the formula that i just gave you
\(\Large p= \pi r + 2l +2w\\p=\pi(3) +2 (6) + 2(3)\)
then solve