Advertisements
Advertisements
प्रश्न
Find the area enclosed between two concentric circles, If their radii are 6cm and 13cm respectively.
Advertisements
उत्तर
We know,
The area of the ring between two concentric circles equals the area of the larger circle minus the area of smaller circle. Let the radius of the outer and inner ring be R and r respectively.
Here, the radius of the outer circle
= 13cm and the radius of the inner circle
= 6cm
The Area of a Circle with radius r = πr2
The area of the ring = π(13)2 - 62)
= `(22)/(7)(169 - 36)`
= `(22)/(7)(133)`
= 22 x 9
= 418cm2.
APPEARS IN
संबंधित प्रश्न
The dimensions of a room are 14 m x 10 m x 6.5 m There are two doors and 4 windows in the room. Each door measures 2.5 m x 1.2 m and each window measures 1.5 m x 1 m. Find the cost of painting the four walls of the room at ₹ `35perm^2` .
Find the perimeter and area of the quadrilateral ABCD in which AB = 17 cm, AD = 9 cm, CD = 12 cm, ∠ACB=90° and AC = 15 cm.
A calf is tied with a rope of length 6 m at the corner of a square grassy lawn of side 20 m . If the length of the rope is increased by 5.5 m , find the increase in area of the grassy lawn in which the calf can graze .
What is the angle subtended at the centre of a circle of radius 6 cm by an arc of length 3 π cm?
If the radius of a circle is diminished by 10%, then its area is diminished by
If area of a circle inscribed in an equilateral triangle is 48π square units, then perimeter of the triangle is
If π is taken as `22/7` the distance (in metres) covered by a wheel of diameter 35 cm, in one revolution, is
What is the diameter of a circle whose area is equal to the sum of the areas of two circles of diameters 10 cm and 24 cm?
In the given figure, PSR, RTQ and PAQ are three semicircles of diameter 10 cm, 3 cm and 7 cm respectively. Find the perimeter of shaded region. [Use π= 3.14]
In the given figure, ABCD is a rectangle with AB = 80 cm and BC = 70 cm, ∠AED = 90° and DE = 42 cm. A semicircle is drawn, taking BC as diameter. Find the area of the shaded region.
