Advertisements
Advertisements
प्रश्न
The area of a circle is 1386 sq.cm; find its circumference.
उत्तर
Area of circle = 1386 cm2
πr2 = 1386
`22/7r^2 = 1386`
`r^2 = 1386 xx 7/22`
`r^2 = 441`
r = `sqrt(441)`
r = 21 cm
circumference = `2pir`
= `2 xx 22/7 xx 21`
= 132 cm
APPEARS IN
संबंधित प्रश्न
Each of the equal sides of an isosceles triangle measure 2 cm more than its height, and the base of the triangle measure 12 cm. Find the area of the triangle.
A 80 m by 64 m rectangular lawn has two roads, each 5 m wide, running through its middle, one parallel to its length and the other parallel to its breadth. Find the cost of gravelling the reads at ₹` 40 per m^2`
The area of a parallelogram is `392m^2` . If its altitude is twice the corresponding base, determined the base and the altitude.
The area of the incircle of an equilateral triangle of side 42 cm is
The area of incircle of an equilateral triangle is 154 cm2 . The perimeter of the triangle is
The minute hand of a clock is 12 cm long. Find the area of the face of the clock described by the minute hand in 35 minutes.
A lawn is in the shape of a semicircle of diameter 42m. the lawn is surrounded by a flower bed of width 7m all round. Find the area of the flower bed in m2.
If the perimeter of a semicircular protractor is 72 cm where `pi = 22/7`, then the diameter of protractor is ____________.
In figure, a square of diagonal 8 cm is inscribed in a circle. Find the area of the shaded region.
Read the following passage:
People of a circular village Dharamkot want to construct a road nearest to it. The road cannot pass through the village. But the people want the road at a shortest distance from the centre of the village. Suppose the road starts from A which is outside the circular village (as shown in the figure) and touch the boundary of the circular village at B such that AB = 20 m. Also the distance of the point A from the centre O of the village is 25 m. |
Based on the above information, answer the following questions:
- If B is the mid-point of AC, then find the distance AC.
- Find the shortest distance of the road from the centre of the village.
- Find the circumference of the village.
OR
Find the area of the village.
