Question

13. A wire is bent in the form of a semicircle of radius 21 cm. What will be the area covered by the same
wire (in cm) if it is bent into a rectangle of length 10 cm?
(a) 440
(b) 436
(c) 256
(d) 224​

Answer 1

Answer:

length of wire =πr+2 r = 22X2l/7+42

66+42 = 108 cm

bent into rectangle, length I

perimeter=108=2(I + b)

108=2(10+b)

1O+b=108/2=54

b =54-l0=44cm

Area of the rectangle =44x10=440

Answer 440cm2