Advertisements
Advertisements
प्रश्न
The circumference of a circle is numerically equal to its area. Find the area and circumference of the circle.
Advertisements
उत्तर
Let the radius of a circle = r cm
⇒ Circumference of a circle = 2πr cm
Area of a circle = πr2
Now,
Circumference of a circle
= Area of a circle
⇒ 2πr = πr2
⇒ 2 = r
Thus, we have
Area of a circle
= πr2
= 3.14 x 2 x 2
= 12.56cm2
Circumference of a circle
= Area of a circle
= 12.56cm2.
APPEARS IN
संबंधित प्रश्न
The sum of the radii of two circles is 140 cm and the difference of their circumferences in 88 cm. Find the diameters of the circles.
Find the area of the rhombus, the length of whose diagonals are 30 cm and 16 cm. Also, find the perimeter of the rhombus.
Choose the correct alternative answer for the following question.
A cone was melted and cast into a cylinder of the same radius as that of the base of the cone. If the height of the cylinder is 5 cm, find the height of the cone.
The perimeter of the quadrant of a circle is 25 cm. Find its area.
Find the area and perimeter of the circle with the following :
Radius= 2.8 cm
Find the diameter of the sphere for the following :
Surface Area = 221. 76 cm2
The radius of a circle is 21 cm. Find the circumference (Take π = `3 1/7`).
A bucket is raised from a well by means of a rope which is wound round a wheel of diameter 77 cm. Given that the ascends in 1 minute 28 seconds with a uniform speed of 1.1 m/sec, calculate the number of complete revolutions the wheel makes in raising the bucket. (Take π =22/7)
The diameter of a circle is 5.6 cm. Find its circumference.
Find the area of the shaded region given in figure
