Advertisements
Advertisements
प्रश्न
Find the circumference of a circle whose area is 81πcm2.
Advertisements
उत्तर
The Area of a Circle with radius r = πr2
Here, Area of a Circle = 81πcm2
⇒ 81π = πr2
⇒ 81 = r2
⇒ r = 9cm
The Circumference of a Circle with radius r = 2πr
The Circumference of a Circle with radius 9
= 2π x 9
= 18πcm.
APPEARS IN
संबंधित प्रश्न
All the vertices of a rhombus lie on a circle. Find the area of the rhombus, if the area of the circle is 1256 cm2. (Use π = 3.14)
A car has wheels which are 80 cm in diameter. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour ?
ABC is an isosceles right-angled triangle with ∠ABC = 90°. A semi-circle is drawn with AC as the diameter. If AB = BC = 7 cm, find the area of the shaded region. [Take π = 22/7]
Four cows are tethered at four corners of a square plot of side 50m, so that’ they just cant reach one another. What area will be left ungrazed.
A square ABCD is inscribed in a circle of radius r. Find the area of the square.
The difference between the circumference and radius of a circle is 37 cm. The area of the circle is
The area of the circle is given below; find the diameter.
176 sq cm
A Rose garden is in the form of circle of radius 63 m. The gardener wants to fence it at the rate of ₹ 150 per metre. Find the cost of fencing?
The area of a quadrant of a circle whose circumference is 22 cm, is ____________.
Ratio of circumference of a circle to its radius is always 2π : 1.
