Area of Circle
Area of Circle
Area of A Circle:
The area enclosed by a circle of radius r is . Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter.
Illustration: Find the area of circle whose radius is 7cm
Solution: Radius r= 7 cm
= 154 sq.cm.
Illustration: The figure shows two circles with the same center. The radius of the larger circle is 10 cm and the radius of the smaller circle is 4 cm.
Find:
(a) the area of the larger circle
(b) the area of the smaller circle
(c) the shaded area between the two circles.
Solution: According to the question
(a) Radius of the larger circle = 10 cm,
So, area of the larger circle =
(b) Radius of the smaller circle = 4 cm,
Area of the smaller circle =
(c) Area of the shaded region = Area of Larger Circle - Area of Smaller Circle
Illustration: A path of width 2m runs around a circular park whose circumference m. Find the area of the path.
If the ratio of areas of two circles is 16 : 25, then the ratio of their circumference is: | |||
| Right Option : C | |||
| View Explanation | |||
A circular disc of area 0.49 | |||
| Right Option : B | |||
| View Explanation | |||
If the area of a circle A1 is 25 times area of a circle A2, then the ratio of their circumference is | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [20]
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8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
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Cheshta
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Aman Kumar Shrivastava
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10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
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8thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
