Question

In the given figure calculate the area of the whole figure and the total length of the boundary of the field ​

Answer 1

Answer:

Solution:

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.

Step-by-step explanation:

Answer 2

Answer:

area = 1386

total length of the boundary of the field ( perimeter) = 132

Step-by-step explanation:

area = pie r ²

22/ 7 × 21 × 21

66× 21

= 1386

perimeter = 2 pie r

2 × 22/ 7 × 21

2× 22 ×3

132