Answer:
10. 91.08mm
11. 33.12in
12. 41.4yd
Step-by-step explanation:
To find the answer to each, we first need to calculate the circumference:
(use 3.14 for π)
(2 * Diameter) * π = Circumference
Then half the circumference (because it is a semicircle) and add it to the diameter once again to accommodate for the middle line.
(Circumference / 2) + Diameter
Do this for each semi-circle as shown here:
10. (2 * 22) * 3.14 = 138.16
(138.16 / 2) + 22 = 91.08
11. (radius is given so double the middle)
(2 * (2 * 4)) * 3.14 = 50.24
(50.24 / 2) + 16 = 33.12
12. (2 * 10) * 3.14 = 62.8
(62.8 / 2) + 10 = 41.4
