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.
A circle is inscribed in a square of side 28 cm. Find the area of the circle (in sq cm). | |||
| Right Option : B | |||
| 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 plane passes 2 cm from the center of a sphere with radius 5 cm. The area of circle formed is: | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [10]
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10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
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Shivam Rana
7thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
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