Advertisements
Advertisements
Question
A gardener wants to fence a circular garden of diameter 21 m. Find the length of the rope he needs to purchase, if he makes 2 rounds of fence. Also find the costs of the rope, if it cost ₹ 4 per meter. (Take `pi = 22/7`)
Advertisements
Solution
d = 21 m
r = `21/2` m
Circumference = 2πr
= `2 xx 22/7 xx 21/2`
= 66 m
Length of rope required for fencing = 2 × 66 m
= 132 m
Cost of 1 m rope = ₹ 4
Cost of 132 m rope = 4 × 132
= ₹ 528
APPEARS IN
RELATED QUESTIONS
Three semicircles each of diameter 3 cm, a circle of diameter 4.5 cm and a semicircle of radius 4.5 cm are drawn in the given figure. Find the area of the shaded region.
If the circumference of a circular sheet is 154 m, find its radius. Also find the area of
the sheet. (Take `pi = 22/7`)
Find the circumference of the inner and the outer circles, shown in the adjoining figure? (Take π = 3.14)
Find the angle subtended at the centre of circle of radius ‘a’ cm by an arc of length
`(api)/4` 𝑐𝑚
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find Length of arc
Find the radius of a circle whose perimeter and area are numerically equal.
Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular cardboard of dimensions 14 cm × 7 cm. Find the area of the remaining cardboard.
A lawn is in the shape of a semi-circle of diameter 42 m. The lawn is surrounded by a flower bed of width 7 m all around. Find the area of the flower bed in m2 .
In the given figure, the area of the shaded portion is 770 cm2. If the circumference of the outer circle is 132 cm, find the width of the shaded portion.
Value of π is ______ approximately.
