Advertisements
Advertisements
Question
Area of a circle with diameter ‘m’ radius ‘n’ and circumference ‘p’ is ______.
Options
2πn
πm2
πp2
πn2
Advertisements
Solution
Area of a circle with diameter ‘m’ radius ‘n’ and circumference ‘p’ is `bb(underline(πn^2))`.
Explanation:
Given, diameter = m, radius = n and circumference = p
∴ Area of circle = πr2 = πn2
APPEARS IN
RELATED QUESTIONS
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find the length of the arc. (Use π = `22/7`)
If the perimeter of a semi-circular protractor is 36 cm, then its diameter is
The area of the sector of a circle of radius 10.5 cm is 69.3 cm2. Find the central angle of the sector.
The cost of fencing a circular field at the rate of Rs 25 per metre is Rs 5500. The field is to be ploughed at the rate of 50 paise per m2 . Find the cost of ploughing the field. [Take `π =22/7`].
In the given figure, a circle is inscribed in an equilateral triangle ABC of side 12 cm. Find the radius of inscribed circle and the area of the shaded region.
[Use `sqrt(3)= 1.73, pi = 3.14]`

A child draws the figure of an aeroplane as shown. Here, the wings ABCD and FGHI are parallelograms, the tail DEF is an isosceles triangle, the cockpit CKI is a semicircle and CDFI is a square. In the given figure, BP ⊥ CD, HQ ⊥ FI and EL ⊥ DF. If CD = 8 cm, BP = HQ = 4 cm and DE = EF = 5 cm, find the area of the whole figure.

The length of an arc of the sector of angle θ° of a circle with radius R is
A piece of wire of length 108 cm is bent to form a semicircular arc bounded by its diameter. Find its radius and area enclosed.
If radius of a circle is increased to twice its original length, how much will the area of the circle increase?
A table cover of dimensions 3 m 25 cm × 2 m 30 cm is spread on a table. If 30 cm of the table cover is hanging all around the table, find the area of the table cover which is hanging outside the top of the table. Also find the cost of polishing the table top at ₹ 16 per square metre.
