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 length of minute hand of a clock is 14 cm. Find the area swept by the minute hand in one minute. (Use π = 22/7)
Find the circumference of the circle with the following radius: (Take `bb(pi = 22/7`)
14 cm
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.
Find the area of the sector of a circle having radius 6 cm and of angle 30°. [Take π = 3.14]
The circumference of a circle is 8 cm. Find the area of the sector whose central angle is 72°.
Find the curved surface area , the total surface area and the volume of a cone if its :
Height = 15 cm , radius = 8 cm
Two circles touch each other externally. The sum of their areas is 5811 cm2 and the distance between their centres is 10 cm. Find the radii of the two circles.
A lawn is in the shape of a semi-circle of diameter 42 m. The lawn is surrounded by a flower bed of width 7 m all around. Find the area of the flower bed in m2 .
Find the perimeter of the given shape (Take π = `22/7`).
Ratio of the circumference of a circle to its diameter is denoted by symbol ______.
