Advertisements
Advertisements
प्रश्न
The area of a circle is 1386 sq.cm; find its circumference.
Advertisements
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
The base of an isosceles triangle measures 80 cm and its area is 2 `360 . cm^2` Find the perimeter of the triangle.
In the given figure ABCD is quadrilateral in which diagonal BD = 24 cm, AL ⊥ BD and CM ⊥ BD such that AL = 9cm and CM = 12 cm. Calculate the area of the quadrilateral.
From a thin metallic piece, in the shape of a trapezium ABCD, in which AB || CD and ∠BCD = 90°, a quarter circle BEFC is removed (in the following figure). Given AB = BC = 3.5 cm and DE = 2 cm, calculate the area of the remaining piece of the metal sheet.
If the adjoining figure is a sector of a circle of radius 10.5 cm, what is the perimeter of the sector? (Take \[\pi = 22/7\])
Find the area of the shaded region in the given figure, if ABCD is a rectangle with sides 8 cm and 6 cm and O is the centre of the circle.
Find the area of the shaded region in the given figure, where a circular arc of radius 6 cm has been drawn with vertex of an equilateral triangle of side 12 cm as centre and a sector of circle of radius 6 cm with centre B is made.
A round table cover has six equal designs as shown in the given figure. If the radius of the cover is 35 cm, then find the total area of the design.
Find the area of the circle, length of whose circumference is equal to the sum of the lengths of the circumferences with radii 15 cm and 13 cm.
If the radii of two circles are in the ratio of 4 : 3, then their areas are in the ratio of ______.
Find the diameter of a circle whose area is equal to the sum of the areas of the two circles of radii 24 cm and 7 cm.
