Advertisements
Advertisements
प्रश्न
The diameter of a circle is 20 cm. Taking π = 3.14, find the circumference and its area.
Advertisements
उत्तर
Diameter of circle (d) = 20 cm
∴ Circumference = dπ = 20 × 3.14 = 62.8 cm
Radius (r) = `"d"/2` = 10 cm
∴ Area of a circle = πr2
= 3.14 × 10 × 10 = 314 cm2
APPEARS IN
संबंधित प्रश्न
A square lawn is surrounded by a path 2.5 m wide. If the area of the path is 165 m2 find the area of the lawn.
In the figure given below, find the area of shaded region: (All measurements are in cm)
In the figure given below, find the area of shaded region: (All measurements are in cm)
The base of a parallelogram is thrice it height. If its area is 768 cm2, find the base and the height of the parallelogram.
The area of a rhombus is 84 cm2 and its perimeter is 56 cm. Find its height.
Find the area of a triangle whose base is 30 cm and the height is 18 cm.
Find the height of a triangle whose base is 18 cm and the area is 270 cm2.
Find the area of a right-angled triangle whose hypotenuse is 13 cm long and one of its legs is 12 cm long.
The sides of a triangle are 21 cm, 17 cm, and 10 cm. Find its area.
The ratio between the areas of two circles is 16 : 9. Find the ratio between their :
(i) radius
(ii) diameters
(iii) circumference
