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The radius and height of a cylinder are in the ratio 3:2 and its volume is 19,404 `cm^3`. Find its radius and

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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Radius of a cylinder is r and the height is h. Find the change in the volume if the (a) height is doubled. (b) height is doubled and the radius is halved. (c) height remains same and the radius is

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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If the length of each edge of a cube is tripled, what will be the change in its

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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A wooden box (including the lid) has external dimensions 40 cm by 34 cm by 30 cm. If the wood is 1 cm thick, how many `cm^3` of wood is used in

asked Jan 17, 2022 in 8th-maths by yogita (1.8k points)

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Three cubes each of side 10 cm are joined end to end. Find the surface area of the resultant

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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A rectangular sheet of dimensions `25 cm xx 7 cm` is rotated about its longer side. Find the volume and the whole surface area of the solid thus

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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Factorise the following using the identity `a^2 – b^2 = (a + b) (a – b)`. `p^5 –

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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The following expressions are the areas of rectangles. Find the possible lengths and breadths of these rectangles. `x^2 – 3x +

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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Factorise the expressions and divide them as directed: `(x^3 + x^2 – 132x) -: x (x –

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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The area of a square is `9x^2 + 24xy + 16y^2`. Find the side of the

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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The curved surface area of a cylinder is `2pi (y^2 – 7y + 12)` and its radius is (y – 3). Find the height of the cylinder (C.S.A. of cylinder

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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The sum of (x + 5) observations is `x^4 – 625`. Find the mean of the

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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Verify the following: `(a^2 – b^2) (a^2 + b^2) + (b^2 – c^2) (b^2 + c^2) + (c^2 – a^2) + (c^2 + a^2) =

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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Verify the following:

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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Find the value of a, if `pq^2a = (4pq + 3q)^2 – (4pq –

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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`3^(–2)` can be written

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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The value of `1/4^-2`

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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The value of `(-2/3)^4` is equal

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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If x be any non-zero integer, then `x^–1` is equal

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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The value of `(7^(–1) – 8^(–1))^(–1) – (3^(–1) – 4^(–1))^(–1)`

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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