Question

A well of diameter 105cm has a 28cm wide parapet running around it. Find the area of the parapet.

Answer 1

Answer:

11704

Step-by-step explanation:

area of parapet =

$\pi \times ({r1}^{2} - {r2}^{2} )$

area =

$\frac{22}{7} \times ({80.5}^{2} - {52.5}^{2} )$

=

$\frac{22}{7} \times 3724$

=

$22 \times 532 = 11704$