Math, asked by himanshukumar727, 1 year ago

Rectangle,cylinder,sphere,hemisphere,cone Ko redius,area,volume

Answers

Answered by brainer9657
6

Answer:

RECTANGLE :  

Area - multiply the length by the width. The formula is: A = L * W where A is the area, L is the length, W is the width, and * means multiply. A square is a rectangle with 4 equal sides.

Radius - Divide both sides by π, then multiply both sides by 2. The radius of the circle is 6, and therefore the diameter is 12. Keep in mind that the diameter of the circle is also equal to the length of the rectangle.

Volume - This formula is often abbreviated as V = l x w x h.

CYLINDER :

Area - To find the surface area of a cylinder add the surface area of each end plus the surface area of the side. Each end is a circle so the surface area of each end is π * r2, where r is the radius of the end. There are two ends so their combinded surface area is 2 π * r2.

Radius - The radius 'r' of a cylinder is the radius of its base. Now, the area of the rectangle = length × breadth. 2πr is the circumference of the circle and h is the height. Area of the curved surface will be = 2πr × h = 2πrh.

Volume - Calculate the area of the base by using the equation πr² where r is the radius of the circle. Then, multiply the area of the base by the height of the cylinder to find the volume.(V=πr2h)

SPHERE :

Area - A=4πr2

Radius - If you know the diameter, you can find the radius of a sphere by dividing the diameter in half. If you know the circumference, you can find the radius by dividing the circumference by 2 times pi. To learn how to calculate the radius of a sphere using two points on the sphere, keep reading!

Volume - formula for the volume of a sphere is volume is equal to 4/3 pi r cubed, where r is the radius of the sphere.

HEMISPHERE :

Area -The surface area of a sphere of radius r is 4 π r2. Half of this is 2 π r2. If this is what is meant by the surface area of a hemisphere then 2 π r2 = 1062.

Radius - If you have a hemispherical object then it has a base which is a circle of radius r. The area of a circle of radius r is π r2 and thus if the hemisphere is meant to include the base then the surface area is 2 π r2 + π r2 = 3 π r2. Hence in this case 3 π r2 = 1062. Solve for r.

Volume -  4/3 π r3. So the volume of a hemisphere is half of that: V = (2 / 3) π r3.

CONE :

Area - surface area of a cone is equal to the curved surface area plus the area of the base: π r 2 + π L r , \pi r^2 + \pi L r, πr2+πLr, where r denotes the radius of the base of the cone, and L denotes the slant height of the cone.

Radius - The radius of a cone is the radius of its circular base. You can find a radius through its volume and height. Multiply the volume by 3. For example, the volume is 20

Volume - V=πr2h /3

hope it helps u ............  : )

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