Advertisements
Advertisements
प्रश्न
The floor of the circular swimming pool whose radius is 7 m has to be cemented at the rate of ₹ 18 per m2. Find the total cost of cementing the floor
उत्तर
Radius of the circular swimming pool r = 7 m
Area of the circular swimming pool A = πr2 sq.units
= `22/7 xx 7 xx 7 "m"^2`
= 154 m2
Cost of cementing a m2 floor = ₹ 18
Cost of cementing 154 m2 floor = ₹ 18 × 154
= ₹ 2,772
APPEARS IN
संबंधित 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)
A lawn is in the form of a rectangle whose sides are in the ratio 5 : 3. The area of the lawn is `3375m^2` . Find the cost of fencing the lawn at ₹ 65 per metre.
Two concentric circles of radii a and b (a > b) are given. Find the length of the chord of the larger circle which touches the smaller circle.
An archery target has three regions formed by three concentric circles as shown in figure. If the diameters of the concentric circles are in the ratios 1 : 2 : 3, then find the ratio of the areas of three regions.
Find the area of the following figure, in square cm, correct to one place of decimal. (Take π = 22/7).
In the following figure, AB = 36 cm and M is mid-point of AB. Semi-circles are drawn on AB, AM and MB as diameters. A circle with centre C touches all the three circles. Find the area of the shaded region.
What is the area of a sector of a circle of radius 5 cm formed by an arc of length 3.5 cm?
Four equal circles, each of radius 5 cm, touch each other, as shown in the figure. Find the area included between them.
The length of the minute hand of a clock is 21 cm. The area swept by the minute hand in 10 minutes is
Is the area of the circle inscribed in a square of side a cm, πa2 cm2? Give reasons for your answer.
