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प्रश्न
Area of circle of radius ‘n’ units is
पर्याय
2πrp sq.units
πm2 sq.units
πr2 sq.units
πn2 sq.units
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उत्तर
Area of circle of radius ‘n’ units is πn2 sq.units
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संबंधित प्रश्न
The dimensions of a room are 14 m × 10 m × 6.5 m. There are two doors and 4 windows in the room. Each door measures 2.5 m × 1.2 m and each window measures 15 m × 1 m. Find the cost of painting the four walls of the room at ₹ 35 per m2.
The cost of painting the four walls of a room 12 m long at ₹ 30 per m2 is ₹ 7560 and the cost of covering the floor with mat at ₹ 25 per m2 is ₹ 2700. Find the dimensions of the room.
The cost of harvesting a square field at ₹ 900 per hectare is ₹ 8100. Find the cost of putting a fence around it at ₹ 18 per metre.
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 \[\pi = \frac{22}{7}\]

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The area of incircle of an equilateral triangle is 154 cm2 . The perimeter of the triangle is
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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. [Take π = 3.14.]

The radius of a wheel is 0.25 m. How many revolutions will it make in covering 11 km?
A circle of the largest area is cut from a rectangular piece of cardboard with dimensions 55 cm and 42 cm. Find the ratio between the area of the circle cut and the area of the remaining card-board.
