Advertisements
Advertisements
Question
Find the cost of polishing a circular table-top of diameter 1.6 m, if the rate of polishing is ₹ 15/m2. (Take π = 3.14)
Advertisements
Solution
Diameter = 1.6 m
Radius = `1.6/2`
= 0.8 m
Area = πr2
= 3.14 × 0.8 × 0.8
= 2.0096 m2
Cost for polishing 1 m2 area = ₹ 15
Cost for polishing 2.0096 m2 area
= 15 × 2.0096
= 30.14
Therefore, it will cost ₹ 30.14 for polishing such circular table.
RELATED QUESTIONS
In the following figure, from a rectangular region ABCD with AB = 20 cm, a right triangle AED with AE = 9 cm and DE = 12 cm, is cut off. On the other end, taking BC as diameter, a semicircle is added on outside' the region. Find the area of the shaded region. [Use π =]`22/7` [CBSE 2014]
In the following figure, OACB is a quadrant of a circle with centre O and radius 3.5 cm. If OD = 2 cm, find the area of the (i) quadrant OACB (ii) shaded region.
If a square is inscribed in a circle, what is the ratio of the areas of the circle and the square?
Find the area of the largest triangle that can be inscribed in a semi-circle of radius runits.
Area of the largest triangle that can be inscribed in a semi-circle of radius r units is ______.
If a square is inscribed in a circle, find the ratio of the areas of the circle and the square.
Find the radius and area of a circle, whose circumference is :
(i) 132 cm
(ii) 22 m
A wire, when bent in the form of a square; encloses an area of 196 cm2. If the same wire is bent to form a circle; find the area of the circle.
The diameters of three wheels are in the ratio 2 : 4 : 8. If the sum of the circumferences of these circles be 132 cm, find the difference between the areas of the largest and the smallest of these wheels.
Find the length of the rope by which a bull must be tethered in order that it may be able to graze an area of 2464 m2
