Advertisements
Advertisements
प्रश्न
Find the area and perimeter of the circles with following: Radius = 2.8cm
Advertisements
उत्तर
The Area of a Circle with radius r = πr2
∴ The Area of a Circle with radius 2.8cm
= π(2.8)2
= `(22)/(7)(2.8)^2`
= 24.64cm2
The Circumference of a Circle with radius r = 2πr
The Circumference of a Circle with radius 2.8
= 2π(2.8)
= `2 xx (22)/(7)(2.8)`
= 17.6cm.
APPEARS IN
संबंधित प्रश्न
In Fig. there are shown sectors of two concentric circles of radii 7 cm and 3.5 cm. Find the area of the shaded region. Use π = `(\frac { 22 }{ 7 }).`
How many times a wheel of radius 28 cm must rotate to go 352 m? (Take `pi = 22/7`)
Find the circumference and area of circle of radius 4.2 cm
In circle of radius 6cm, chord of length 10 cm makes an angle of 110° at the centre of circle find The area of sector
Find the area of the rhombus, the length of whose diagonals are 30 cm and 16 cm. Also, find the perimeter of the rhombus.
In the given figure, from a rectangular region ABCD with AB = 20 cm, a right triangle AED with AE = 9 cm and DE = 12 cm, is cut off. On the other end, taking BC as diameter, a semicircle is added on outside' the region. Find the area of the shaded region. [Use π = 3.14]
A wire is in the form of a circle of radius 42 cm. It is bent into a square.
Determine the side of the square and compare the area of the regions enclosed in two cases.
The sum of the circumference and diameter of a circle is 116 cm. Find its radius.
Find the circumference of a circle whose area is 81πcm2.
Find the circumference of the circle whose area is 25times the area of the circle with radius 7cm.
