Advertisements
Advertisements
प्रश्न
Find the area and perimeter of the circles with following: Diameter = 35cm
Advertisements
उत्तर
The radius of a Circle with diameter d is r = `"d"/(2)`
The Area of a Circle with radius r = πr2
The radius of a Circle with diameter 35 is r
= `(35)/(2)`
= 17.5cm
The Area of a Circle with radius r
= π(17.5)2
= `(22)/(7) xx (17.5)^2`
= 962.5cm2
The Circumference of a Circle with diameter d is πd
The Circumference of a Circle with diameter 35 is π x 35
= `(22)/(7) xx 35`
= 110cm.
APPEARS IN
संबंधित प्रश्न
The wheels of the locomotive of a train are 2.1 m in radius. They make 75 revolutions in one minute.
The area of an equilateral triangle is `49sqrt(3)` cm2 . Taking each angular point as centre, circles are drawn with radius equal to half the length of the side of the triangle. Find the area of the triangle not included in the circles. [Take π = 1.73]
The radii of two concentric circles are 19 cm and 16 cm respectively. The area of the ring enclosed by these circles is
In making 1000 revolutions, a wheel covers 88 km. The diameter of the wheel is
The diameter of a cycle wheel is `4 5/11` cm. How many revolution will it make in moving 6.3 km ?
The speed of the car is 66 km/hour. If each wheel of the car is 140 cm in diameter, find the number of revolutions made by each wheel per minute.
Find the volume and the surface area of the spheres in the following :
Diameter= 6.3 cm
The circumference of a circle exceeds its diameter by 450 cm. Find the area of the circle.
Find the radius of a circle whose circumference is equal to the sum of the circumferences of two circles of radii 15 cm and 18 cm.
In reference to a circle the value of π is equal to ______.
