Advertisements
Advertisements
Question
The diameter of a circle is 42 cm, find its perimeter. If the perimeter of the circle is doubled, what will be the radius of the new circle? (Take π = `22/7`)
Advertisements
Solution
Given, the Diameter of a circle = 42 cm
∴ Radius of circle = `42/2` = 21 cm
The perimeter of the circle = 2πr
=`2xx22/7xx21`
= 132 cm
If the perimeter of the circle doubled
= 2 × 132 =264 cm
Radius = `"C"/(2π)=264/(2xx22/7)`
= `(264xx7)/(2xx22)`
= 42 cm
APPEARS IN
RELATED QUESTIONS
Find the perimeter of a rectangle with length = 24 cm and diagonal = 25 cm
The length and the breadth of a rectangle are 36 cm and 28 cm. If its perimeter is equal to the perimeter of a square, find the side of the square.
Find the perimeter of a square whose each side is 1.6 m.
A wire is bent in the form of an equilateral triangle of each side 20 cm. If the same wire is bent in the form of a square, find the side of the square.
Write the perimeter of the figure in the box given below it.
If a square of side 1 cm is cut out of the corner of a larger square with side 3 cm (see the figure), what will be the perimeter of the remaining shape?
How much wire will be needed to make a rectangle of length 6 cm and breadth 3 cm?
Perimeter of the shaded portion in the following figure is ______.
AB + _ + _ + _ + _ + _ + _ + HA
To find the cost of a frame of a picture, we need to find the perimeter of the picture.
Perimeter of an isosceles triangle is 50 cm. If one of the two equal sides is 18 cm, find the third side.
