Question

from A circular piece of card boaird of radius 3 cm two sector of 90. have been cut out fun the perimeter of remaining portion nearest hundred metre

Answer 1

Two sector of 90 degree cut out(90*2=180 degree) means semicircle
perimeter of circle= 2πr
= 2*22/7*3=18.85 cm
perimeter of semicircle=18.85/2=9.42 cm approx

Answer 2

Answer:

Perimeter of the remaining portion = 9.42 cm

Step-by-step explanation:

Degree of each sector which has been cut out = 90°

Number of sectors removed from the circular board = 2

Total degrees cut out from the board = 2 × 90 = 180°

So, the removed part formed a semicircle and also the remaining portion is a semicircle.

Now, radius = 3 cm

Perimeter of the remaining semicircle = π × r

Perimeter of the remaining semicircle = 3.14 × 3

Hence, Perimeter of the remaining portion = 9.42 cm