Question

Puja decides to cut a circular disk in 4 equal parts. What is the perimeter of each part?

(Given that the radius of the disk = 7cm)

$(Use\pi =\frac{22}{7})$

• A. 38.4 cm
• B. 25 cm
• C. 25.4 cm
• D. 27.4 cm

Answer 1

The correct option is B

25 cm

When a circular disk is cut into four equal parts, the perimeter is more than $\frac{2\pi r}{4}$ because two radii also add to the perimeter.

Perimeter

$=\frac{2\pi r}{4}+r+r$

$=\frac{\pi r}{2}+2r$

$=11+2\times 7$

$=25cm$