Question

If a wire is bent into the shpe of square then area of square is 81 sqcn when wire is bent into semi circle

Answer 1

77 sq. cm(option 3)

Explanation:

length of each side of the square

=

√

81

=

9

perimeter of the square

=

4

⋅

9

=

36

total length of the semicircle

=

π

r

+

2

r

=

r

(

22

7

+

2

)

=

36

r

7

36

=

36

r

7

r

=

7

area of semicircle

=

π

r

2

2

=

22

7

⋅

49

⋅

1

2

=

77

s

q

.

c

m

(

o

p

t

i

o

n

3

)