Advertisements
Advertisements
प्रश्न
Find the area and perimeter of the circles with following: Diameter = 77cm
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 77 is r
= `(77)/(2)`
= 38.5cm
The Area of a Circle with radius r
= π(38.5)2
= `(22)/(7) xx (38.5)^2`
= 4658.5cm2
The Circumference of a Circle with diameter d is πd
The Circumference of a Circle with diameter 77 is π x 77
= `(22)/(7) xx 77`
= 242cm.
APPEARS IN
संबंधित प्रश्न
The circumference of a circle exceeds the diameter by 16.8 cm. Find the radius of the circle.
Three semicircles each of diameter 3 cm, a circle of diameter 4.5 cm and a semicircle of radius 4.5 cm are drawn in the given figure. Find the area of the shaded region
A doorway is decorated as shown in the figure. There are four semi-circles. BC, the diameter of the larger semi-circle is of length 84 cm. Centres of the three equal semicircles lie on BC. ABC is an isosceles triangle with AB = AC. If BO = OC, find the area of the shaded region. (Take `pi = 22/7`)
What is the perimeter of a square which circumscribes a circle of radius a cm?
In a circle of radius 14 cm, an arc subtends an angle of 120° at the centre. If `sqrt(3) = 1.73` then the area of the segment of the circle is
Diameter of the circular garden is 42 m. There is a 3.5 m wide road around the garden. Find the area of the road.
Find the curved surface area , the total surface area and the volume of a cone if its :
Height = 12 cm , radius = 5 cm
Find the area enclosed between two concentric circles, if their radii are 6 cm and 13 cm respectively.
There are two circular gardens A and B. The circumference of garden A is 1.760 km and the area of garden B is 25 times the area of garden A. Find the circumference of garden B.
Formula used to find the circumference of a circle is
