Question

2️⃣Assertion (A): If the height of a cylinder becomes 1/4 of the original height and the radius is doubled, then the curved surface area of the cylinder will be doubled.
Reason (R): Curved surface area of a right circular cylinder of radius 'r' and height 'h' is given by 2πrh

2️⃣Assertion (A): If the height of a cylinder becomes 1/4 of the original height and the radius is doubled, then the curved surface area of the cylinder will be doubled.
Reason (R): Curved surface area of a right circular cylinder of radius 'r' and height 'h' is given by 2πrh.
3️⃣Which of the following is not true?
(A) A point in which the x-coordinate is zero and y-coordinate is nonzero will lie on the Y-axis.
(B) For the point (5, 2), the distance from the x -axis is 2 units.
(C) A point which lies on both the axis is (0, 0).
(D) The coordinates of a point at a distance of 3 units from the x axis and 6 units from the y axis is (3, 6)

Pliz guys just help me guys! ​

Answer 1

Answer:

Let the new height and radius be h / 4 and 2 r respecitvely,

where r and h are original radius and original height of the cylinder respectively.

We know that, curved surface are of cylinder= 2πrh

Then, curved surface of the new cylinder =

= 2\pi (2r) ×

4

1

h=4πr×

4

1

h=2πrh

=

2

1

×2πrh [multiplying and dviding by 2 ]

=

2

1

original curved surface area.

Answer 2

Answer:

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