Question

21

The curved parts of the figure are arcs centered at points A and C. What is the approximate length of boundary ABCD? Use the value = 3.14, and
round the answer to one decimal place.
A
5
120*
30°

Answer 1

Answer: 21.9

Step-by-step explanation: To find the length of boundary ABCD, we add the lengths of each line segment and the two arcs. AB is 5, BC is (120/360) * 2 * pi * 5 = 10pi/3, CD is 5, and DA is (30/360) * 2 * pi * 5 = pi/3. Adding these lengths, we get (20pi + 15)/3, which is approximately 21.9 when rounded to one decimal place.

- Lizzy ˚ʚ♡ɞ˚