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

Answer:

C. 30

Step-by-step explanation:

circumference of the semicircular plot

$=\frac{1}{2}\times\pi d+d\\\\=\frac{1}{2}\times 3.14\times 35+ 35\\\\= \frac{1}{2}\times 109.9+35\\\\= 54.95+35\\\\= 89.95\\\\No. \: of\: poles= \frac{89.95}{3}\\\\= 29.98\\\\\approx 30$