Advertisements
Advertisements
Question
Find in terms of x the length of the arc that subtends an angle of 30°, at the centre of circle of radius 4 cm.
Solution
Length of arc =`theta/360°`× 2𝜋𝑟
Radius = r = 4 cm
𝜃 = angle subtended at centre = 30°
Arc length =`30^@/360^@`× 2 × (7)
=`(2pi)/3`cm
APPEARS IN
RELATED QUESTIONS
A plot is in the form of rectangle ABCD having semi-circle on BC. If AB = 60m and BC = 28m, find the area of plot.
The radius of a circular garden is 100 m. There is a road 10 m wide, running all around it. Find the area of the road and the cost of levelling it at Rs 20 per m2. [Use π = 3.14]
The circumferences of two circles are in the ratio 3 : 4. The ratio of their areas is
A canvas tent is in the shape of a cylinder surmounted by a conical roof. The common diameter of the cone and the cylinder is 14 m. The height of the cylindrical part is 8 m and the height of the conical roof is 4 m. Find the area of the canvas used to make the tent.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| 7 cm | ______ | _______ |
Find the area and perimeter of the circles with following: Diameter = 77cm
Diameters of different circles are given below. Find their circumference (Take π = `22/7`)
d = 70 cm
The diameter of a circular well is 4.2 m. What is its circumference?
A wire of length 1320 cm is made into circular frames of radius 7 cm each. How many frames can be made?
The area of a circular playground is 22176 m2. Find the cost of fencing this ground at the rate of Rs 50 per metre.
