SaiBook.us Geometry

Lesson Example Discussion Quiz: Class Homework

Lesson

Title: Volume of 3d-shapes(cone , cylinder)

Grade: 4-a Lesson: S3-L4

Explanation: Hello students, let us learn a new topic in geometry today with definitions, concepts, examples, and worksheets included.

Lesson:

Definition: Cone

A cone is a three-dimensional shape that has a circular base and a pointed top called the apex. It looks like an ice cream cone or a party hat.

The volume of a cone is the amount of space inside the cone.

To find the volume, use the formula: V = \$1/3πr^2h\$ where r is radius and h is height.

$1$

Explanation: In this image, the volume of the ice cream cone is 56.53 \$cm^3\$, with a radius of 3 cm and a height of 6 cm by using the formula V = \$1/3πr^2h\$

Definition: Cylinder

A cylinder is a 3D shape that has two circular bases connected by a curved surface. It looks like a can of soda or a soup can.

The volume of a cylinder is the amount of space inside it.

Measured the radius using the formula V = \$πr^2h\$

Measured the diameter, use the formula V = \$(πd^2)/4\$

$2$

Explanation: In this image, the radius of the can is 3 cm and the height is 10 cm. Therefore, the volume of the soda can is 282.6 cubic centimeters by using the formula V = πr^2h.