Advertisements
Advertisements
प्रश्न
The diameter of a circle is 28 cm.
Find its :
(i) Circumference
(ii) Area.
उत्तर
Let r be the radius of the circle.
(i) 2r = 28 cm
circumference = 2πr
= 28π cm
= 88 cm
(ii) area = πr2
= π `(28/2)^2`
= 196π cm2
= 616 cm2
APPEARS IN
संबंधित प्रश्न
In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the side of the square where O and O' are centres of the circles. Find the area of shaded region.
Saima wants to put a lace on the edge of a circular table cover of diameter 1.5 m. Find the length of the lace required and also find its cost if one meter of the lace costs ₹ 15. (Take π = 3.14)
Below fig shows a sector of a circle, centre O. containing an angle 𝜃°. Prove that
Area of shaded region is`r^2/2(tantheta −(pitheta)/180)`
Find the radius of a circle whose perimeter and area are numerically equal.
In making 1000 revolutions, a wheel covers 88 km. The diameter of the wheel is
A cylindrical bucket, whose base radius is 20 cm, is filled with water to a height of 25 cm. A heavy iron spherical ball of radius 10 cm is dropped to submerge completely in water in the bucket. Find the increase in the level of water.
A wire when bent in the form of a square encloses an area of 484cm2. If the same wire is bent into the form of a circle, find the area of the circle.
Find the circumference of the circle whose area is 25times the area of the circle with radius 7cm.
Find the radius of a circle whose circumference is equal to the sum of the circumferences of two circles of radii 15 cm and 18 cm.
The area of a circular playground is 22176 m2. Find the cost of fencing this ground at the rate of Rs 50 per metre.
