Advertisements
Advertisements
प्रश्न
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
उत्तर
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.
APPEARS IN
संबंधित प्रश्न
A 36-m-long, 15-m-borad verandah is to be paved with stones, each measuring 6dm by 5 dm. How many stones will be required?
A rectangular plot measure 125 m by 78 m. It has gravel path 3 m wide all around on the outside. Find the area of the path and the cost of gravelling it at` ₹ 75 per m^2`
Two circular pieces of equal radii and maximum area, touching each other are cut out from a rectangular card board of dimensions 14 cm × 7 cm. Find the area of the remaining card board. `[\text{Use}pi=22/7]`
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`)
The diameter of a coin is 1 cm (in the following figure). If four such coins be placed on a table so that the rim of each touches that of the other two, find the area of the shaded region (Take π = 3.1416).
In the given figure, ABCD is a trapezium with AB || DC, AB = 18 cm DC = 32 cm and the distance between AB and DC is 14 cm. Circles of equal radii 7 cm with centres A, B, C and D have been drawn. Then find the area of the shaded region.
(Use \[\pi = \frac{22}{7}\]
Find the area of the largest triangle that can be inscribed in a semi-circle of radius runits.
The perimeter of a triangle is 30 cm and the circumference of its incircle is 88 cm. The area of the triangle is
Find the area of the shaded portion in each of the following diagrams:
(i)
(ii)
Find the area of a circle of radius 30 cm (use π = 3.14).
