The figure shows a rectangular field STUV. Asher walked from S to T to U to V and he covered a distance of 66 m. Jane walked from T to U to V to S and she covered a distance of 42 m.
- What is the perimeter of the field?
- Some construction work was undertaken to the same field and a semi-circular part was removed from it. What Is the perimeter of the field after the construction? (Take π = 227)
(a)
Lets assume Length → L and Breadth → B
Asher total covered distance
L + L + B = 66
2 L + B = 66 = A1
Jane total covered distance
B + L + B = 42
2 B + L = 42 = A2
A1 + A2
3 B + 3 L = 108
B + L = 108 ÷ 3 = 36 m
Perimeter of the field
= 2 (B + L)
= 2 x 36
= 72 m
(b)
Circumference of the semicircle
=
227 x 7 x
12 = 11 m
Perimeter of the remaining field
= 72 + 11 - 7
= 76 m
Answer(s): (a) 72 m; (b) 76 m