Advertisements
Advertisements
प्रश्न
A roller has a diameter of 1.4 m. Find :
(i) its circumference ;
(ii) the number of revolutions it makes while travelling 61.6 m.
Advertisements
उत्तर
Diameter = 1.4 m
r = `1.4/2 = 0.7` m
∴ Circumference of roller = `2pir`
= `2 xx 22/7 xx 0.7 = 4.4` m
Revolutions made in 4.4 m distance = 1
Revolutions made in 1 m distance = `1/4.4`
Revolutions made in 61.6 m distance
= `1/4.4 xx 61.6 = 616/44 = 14`
Hence (i) 4.4 m (ii) 14
APPEARS IN
संबंधित प्रश्न
A rectangular park 358 m long and 18 m wide is to be covered with grass, leaving 2.5 m uncovered all around it. Find the area to be laid with grass.
The outer circumference of a circular race-track is 528 m . The track is everywhere 14 m wide. Calculate the cost of levelling the track at the rate of 50 paise per square metre.
`(use pi=22/7). `
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find the area of the sector formed by the arc. (Use π = `22/7`)
Find the area of minor segment of a circle of radius 14 cm, when the angle of the corresponding sector is 600 .
In the following figure, ABC is a right-angled triangle, ∠B = 90°, AB = 28 cm and BC = 21 cm. With AC as diameter a semicircle is drawn and with BC as radius a quarter circle is drawn. Find the area of the shaded region correct to two decimal places.
An arc subtends an angle of 90° at the centre of the circle of the radius 14 cm. Write the area of minor sector thus formed in terms of π.
The perimeter of a triangle is 30 cm and the circumference of its incircle is 88 cm. The area of the triangle is
The following figure shows two circles with the same center. The radius of the larger circle is 10 cm and the radius of the smaller circle is 4 cm.
Find:
(a) the area of the larger circle
(b) the area of the smaller circle
(c) the shaded area between the two circles. (π = 3.14)
The circumference of a circular park is 352 m. Find the area of the park
A circular park is surrounded by a road 21 m wide. If the radius of the park is 105 m, find the area of the road.
