Question

a piece of wire is in the form of rectangle whose length and breadth are 35 cm and 31 CM respectively it is remained in the form of a circle find the radius of the circle

Answer 1

hiii!!!

here's ur answer...

perimeter of rectangle=circumference of circle

given length of the rectangle is 35cm and breadth is 31cm.

hence it's perimeter=2(l+b)

=2(35+31)

=2×66

=132cm

therefore circumference of circle is also 132cm.

therefore 2πr=132cm

→2×22/7×r=132cm

→44/7×r=132cm

→r=132/1×7/44

→r=3×7

→r=21cm

verification:-

circumference of circle=2πr

=2×22/7×21

=44×3

=132cm

hence verified

thus the radius of the circle is 21cm

hope this helps..!

☺☺☺

Answer 2

find the circumference 
(35 +31)x2=132cm
22/7 x D =132
d =42
r=21cm