Advertisements
Advertisements
प्रश्न
A sprinkler placed at the centre of a flower garden sprays water covering a circular area. If the area watered is 1386 cm2, find its radius and diameter
Advertisements
उत्तर
Area of the Circle = πr2 sq.units
Area of the circular portion watered = 1386 cm2
πr2 = 1386
`22/7 xx "r"^2` = 1386
r2 = `1386 xx 7/22`
= 63 × 7
= 9 × 7 × 7
r2 = 32 × 72
r = 3 × 7
Radius (r) = 21 cm
Diameter (d) = 2r = 2 × 21 cm
Diameter (d) = 42 cm
APPEARS IN
संबंधित प्रश्न
A rectangular park 358 m long and 18 m wide is to be covered with grass, leaving 2.5 m uncovered all around it. Find the area to be laid with grass.
The cost of painting the four walls of a room 12 m long at `₹ 30 per m^2 is ₹ 7560 per m^2` and the cost of covering the floor with the mat at ₹` 25 per m^2 is ₹ 2700 `. find the dimensions of the room.
In the following figure, ABCD is a trapezium of area 24.5 cm2 , If AD || BC, ∠DAB = 90°, AD = 10 cm, BC = 4 cm and ABE is quadrant of a circle, then find the area of the shaded region. [CBSE 2014]
If area of a circle inscribed in an equilateral triangle is 48π square units, then perimeter of the triangle is
In the given figure, PQ = 24, PR = 7 cm and O is the centre of the circle. Find the area of the shaded region.
The area of a sector of a circle with radius r, making an angle of x° at the centre is
A chord of a circle of radius 14 cm a makes a right angle at the centre. Find the area of the sector.
The area of a circle is 1386 sq.cm; find its circumference.
The radius of a circular wheel is 42 cm. Find the distance travelled by it in :
(i) 1 revolution ;
(ii) 50 revolutions ;
(iii) 200 revolutions ;
In the following figure, a rectangle ABCD enclosed three circles. If BC = 14 cm, find the area of the shaded portion (Take π = 22/7)
