RRB Group-D Model Paper 15 with answers for online practice

Question : 22 of 100

Marks: +1, -0

The area of a semi-circle having diameter 28 cm is equal to the area of a rectangle having breadth 11 cm. Find the area of a square having side equal to the length of the rectangle.

784 $cm^2$
484 $cm^2$
121 $cm^2$
228 $cm^2$

Validate

Solution:

We know that,
Radius of semicircle = 28/2 = 14 cm
Area of semi circle =

{22/7×14×14}/2=308 cm^2

Now,
∴ Area of rectangle = 308 = 11 × length
⇒ Length = 28 cm.
Hence, side of square = 28 cm
∴ Area of square = side × side = 28 × 28 = 784

cm^2

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