Question

Ch 15-10
13. A path 2 m wide surrounds a circular pond of diameter
40 m. How many cubic metre of gravel are required
to gravel the path to a depth of 7 CM? ​

Answer 1

Step-by-step explanation:

your answer_____________

Answer 2

Answer:

184.8

Step-by-step explanation:

Answer: 184.8 cubic meters of gravels are required to gravel the path to a depth of 7 cm.

Step-by-step explanation:

Since we have given that

Diameter of circular pond = 40 m

Radius of circular pond = 20 m

Width of path = 2 m

So, Radius of outer path = 20+2 = 22 m

Depth = 7 cm

So, Volume of gravels would be

\begin{gathered}\pi (R^2-r^)h\\\\=\dfrac{22}{7}\times (22^2-20^2)\times 0.7\\\\=\dfrac{22}{7}\times 42\times 2\times 0.7\\\\=184.8\ m^3\end{gathered}

π(R

2

−r

)

h

=

7

22

×(22

2

−20

2

)×0.7

=

7

22

×42×2×0.7

=184.8 m

3

Hence, 184.8 cubic meters of gravels are required to gravel the path to a depth of 7 cm.