Advertisements
Advertisements
प्रश्न
Find the area and perimeter of the circles with following: Diameter = 35cm
उत्तर
The radius of a Circle with diameter d is r = `"d"/(2)`
The Area of a Circle with radius r = πr2
The radius of a Circle with diameter 35 is r
= `(35)/(2)`
= 17.5cm
The Area of a Circle with radius r
= π(17.5)2
= `(22)/(7) xx (17.5)^2`
= 962.5cm2
The Circumference of a Circle with diameter d is πd
The Circumference of a Circle with diameter 35 is π x 35
= `(22)/(7) xx 35`
= 110cm.
APPEARS IN
संबंधित प्रश्न
Choose the correct alternative answer for the following question.
The curved surface area of a cylinder is 440 cm 2 and its radius is 5 cm. Find its height.
The radius of the circle is given below; find the area.
28 cm
A conical tent requires 264 m2 of canvas. If the slant height is 12 m, find the vertical height of the cone.
Find the area and perimeter of the following sector :
Radius= 6 cm, angle at the centre is 70°
Find the area and perimeter of the following sector :
Diameter = 42 cm, angle at the centre is 100·.
The diameter of a wheel is 1.4m. How many revolutions does it make in moving a distance of 2.2 kms?
Find the diameter of a circle whose circumference is equal to the sum of circumference of circles with radius 10 cm, 12 cm, and 18 cm.
The cost of fencing a circular field at the rate of Rs.250 per metre is Rs.55000. The field is to be ploughing at the rate of Rs.15 per m2. Find the cost of ploughing the field.
Areas of two circles are equal. Is it necessary that their circumferences are equal? Why?
A circle with radius 16 cm is cut into four equal parts and rearranged to form another shape as shown in the below figure:
Does the perimeter change? If it does change, by how much does it increase or decrease?
