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.
When the circumference and area of a circle are numerically equal, then the diameter is numerically equal to: | |||
| Right Option : D | |||
| View Explanation | |||
A wire bent in the form of a circle of radius 42 cm is cut and again bent in the form of a square. The ratio of the regions enclosed by the circle and the square in the two cases is given by: | |||
| Right Option : D | |||
| View Explanation | |||
A circular disc of area 0.49 | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [20]
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Eshan Arora
8thThird consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
Ayan Ghosh
8thAbhyas 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
Yatharthi Sharma
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Cheshta
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Om Umang
10thIn 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...
Aman Kumar Shrivastava
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Barkha Arora
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
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Aman Kumar Shrivastava
10thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
