Advertisements
Advertisements
प्रश्न
Find the area and perimeter of the circles with following: Diameter = 35cm
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 35 is r
= `(35)/(2)`
= 17.5cm
The Area of a Circle with radius r
= π(17.5)2
= `(22)/(7) xx (17.5)^2`
= 962.5cm2
The Circumference of a Circle with diameter d is πd
The Circumference of a Circle with diameter 35 is π x 35
= `(22)/(7) xx 35`
= 110cm.
APPEARS IN
संबंधित प्रश्न
An arc of length 20𝜋 cm subtends an angle of 144° at centre of circle. Find the radius of the circle.
The diameter of a cycle wheel is `4 5/11` cm. How many revolution will it make in moving 6.3 km ?
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 area enclosed between two concentric cirdes of radii 6.3 cm and 8.4 cm. A third concentric circle is drawn outside the 8.4 cm circle, so that the area enclosed between it and 8.4 cm cirde is the same as that between two inner circles. Find the radii of the third circle correct to two decimal places .
The diameter of a right circular cylinder is 12 m and the slant height is 10 m. Find its curved surface area and the total surface area .
A solid sphere metal is cut through its centre into 2 equal parts. If the diameter of the sphere is 3`1/3` cm , find the total surface of each part, correct to two decimal places.
AC and BD are two perpendicular diameter of a circle ABCD. Given that the area of shaded portion is 308 cm2 calculate:
(i) The length of AC and
(ii) The circumference of circle
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 72.6 cm |
The diameter of two circles are 28 cm and 24 cm. Find the circumference of the circle having its area equal to sum of the areas of the two circles.
The area of a circular playground is 22176 m2. Find the cost of fencing this ground at the rate of Rs 50 per metre.
