Question

Unit Test 4

A plot of land is in the shape of a
semicircle of diameter 35 metres as
shown below.
The plot was fenced by erecting posts
3 metres apart. How many posts
22
were used? (TC
7
A. 31 B. 29 C. 30
29 C. 30 D. 36
= 22​

Answer 1

C. 30

Explanation:

circumference of the semicircular plot

`=(1)/(2)*\pi d+d\\\\=(1)/(2)* 3.14* 35+ 35\\\\= (1)/(2)* 109.9+35\\\\= 54.95+35\\\\= 89.95\\\\No. \: of\: poles= (89.95)/(3)\\\\= 29.98\\\\\approx 30`