Advertisements
Advertisements
प्रश्न
Find the circumference of the circle whose area is 25times the area of the circle with radius 7cm.
Advertisements
उत्तर
The Area of a Circle with radius r = πr2
The Area of a Circle with radius7 = π(7)2
The Area of the bigger Circle
= 25 x π(7)2
= π(72 x 52)
= π(352)
Let radius of the bigger Circle = R
R2 = π(352)
⇒ radius of the bigger Circle = 35
The Circumference of a Circle with radius r = 2πr
The Circumference of a Circle with radiu 35r
= 2π x 35
= 220cm.
APPEARS IN
संबंधित प्रश्न
A sheet of paper is in the form of rectangle ABCD in which AB = 40cm and AD = 28 cm. A semicircular portion with BC as diameter is cut off. Find the area of remaining paper.
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.
In the given figure, find the area of the shaded region, if ABCD is a square of side 14 cm and APD and BPC are semicircles.
Find the perimeter of the shaded region in the figure, if ABCD is a square of side 14 cm and APB and CPD are semicircles.
The sum of the radii of two circles is 7 cm, and the difference of their circumferences is 8 cm. Find the circumference of the circles.
The difference between the circumference and radius of a circle is 37 cm. The area of the circle is
Find the area of a circle whose circumference is 22 cm.
If the perimeter of a semi-circular protractor is 36 cm. Find its diameter.
The cost of decorating the circumference of a circular lawn of a house at the rate of ₹ 55 per metre is ₹ 16940. What is the radius of the lawn?
In a circle of diameter 42 cm, if an arc subtends an angle of 60° at the centre, where `pi = 22/7` then length of an arc is ____________.
