Question

Que to
In the figure, calculate
(a) the area of the whole figure .
(b) the total length of the boundary of the field
length of the boundary of the field
80 cm
42cm​

Answer 1

Answer:

292 cm

Step-by-step explanation:

Area of the rectangular portions = l × b = 80 cm × 42 cm = 3360 cm2

Area of two semicircles = 2 × 12 πr2 = πr2

= 227 × 21 × 21

= 22 × 3 × 21

= 1386 cm2

Total area = 3360 cm2 + 1386 cm2 = 4746 cm2

Total length of the boundary of field = (2 × 80 + πr + πr) cm

= (160 + 227 × 21 + 227 × 21)

= (160 + 132) cm

= 292 cm

Hence, the required (i) area = 4746 cm2 and (ii) length of boundary = 292 cm.