Question

Ram says that 22 bags of cement were required to cement a circular platform. If one bag of cement is required to cement an area of 7 m², then find the area and the radius of the circular platform.

• A. 154 ,7 m
• B. 154 m²,7 m
• C. 154 m²,70 cm
• D. 22 m²,7 m

Answer 1

The correct option is B

154 m²,7 m

Number of cement bags used = $\frac{areaofcircularplatform}{areacementedby1bag}$

$\Rightarrow$ Area of circular platform = 22 $\times$ 7 $m^2$ = 154$m^2$

$\Rightarrow$ Area of circle = π$r^2$

$\Rightarrow$ $\frac{22}{7}$ ×$r^2$ = 154$m^2$

So, r = 7 m