# Relationship between volume of a cylinder and cone

### Eighth Grade / Relationship Between the Volume of a Cylinder & a Cone

In This Part: Cross-Section Method | Cylinders, Cones, and Spheres What is the relationship between the volume of the sphere and the volume of the cylinder . Evaluate the outcomes of this activity; Analyze the relationship between the volume of the cone and cylinder; Explain the ratio of the volume of a cone and a. The volume formulas for cones and cylinders are very similar: Question: what is the relationship between the volume of a cone and half a sphere (a.

What are the dimensions involved in a cylinder? What is a cone? What are some examples of items shaped like a cone? How many dimensions does a cone have? How will the teacher present the concept or skill to students?

I do, We do, You do The teacher I do introduces today's lesson, the handout and demonstrates to the class how to start the activity. The teacher, through guided practice, leads the whole class we do to the understanding of the goal of this activity.

The teacher will pose questions such as, What is a cone? What is the base of a cone and what is the base of the cylinder? Is there a difference between them? The teacher demonstrates the two objects, a cone and a cylinder. The teacher holds the two bases against each other. The teacher continues with similar questions about height. The teacher demonstrate that these objects have the same heights by putting the objects on a flat surface and hold a ruler on top of the cylinder and slides the cone under the ruler to show the two objects have the same height.

The students you do are in groups of four, followed by determine the roles for each of the students in their group Reader, cutter, taper, speaker. The speaker gets the handout of the group activity.

### Volume of Cone and Cylinder | mephistolessiveur.info

The students get about 20 minutes to complete the construction of the models. The speaker is the one that will solicit teacher support when needed. Next, the students are to hold the cylinder model, fill it up with sand, and pour the cylinder content into an empty jar.

Mark that level on the jar, then empty the jar. Then, the students are to hold the cone model, fill it with sand, and pour it into the emptied jar.

This time in a different color, mark the level of the cone content. How do these levels compare? How many times do I need to repeat the steps to get the same level? What activities or exercises will the students complete with teacher guidance? The teacher will give the spokesperson the group activity: The spokesperson will assign the tasks within the group.

The teacher will stand-by to facilitate the activity progress if the group exhausts their options. What activities or exercises will students complete to reinforce the concepts and skills developed in the lesson?

Independent practice is when each group member is to explain, in their own words, the outcome of their group experiment, and write a short paragraph about their conclusion.

Please see second page of Cones and Cylinders - Student Handout. Evaluation of this is left to the teacher's discretion, but students must mention the 1: How will the teacher assist students in organizing the knowledge gained in the lesson?

The teacher asks randomly for feedback on the shapes: What objects have you just constructed?

**Comparing spheres, cones, and cylinders**

What is the volume formula of your object? What is the ratio between the volume of these objects? The teacher will post a cylinder volume problem on the board and probe the class for an answer. In a similar way, the volumes of a cone and a cylinder that have identical bases and heights are proportional.

If a cone and a cylinder have bases shown in color with equal areas, and both have identical heights, then the volume of the cone is one-third the volume of the cylinder.

Imagine turning the cone in the figure upside down, with its point downward. If the cone were hollow with its top open, it could be filled with a liquid just like an ice cream cone.

## Volume of Cone and Cylinder

One would have to fill and pour the contents of the cone into the cylinder three times in order to fill up the cylinder. The figure above also illustrates the terms height and radius for a cone and a cylinder. The base of the cone is a circle of radius r. The height of the cone is the length h of the straight line from the cone's tip to the center of its circular base. Both ends of a cylinder are circles, each of radius r.

The height of the cylinder is the length h between the centers of the two ends. The volume relationship between these cones and cylinders with equal bases and heights can be expressed mathematically. The volume of an object is the amount of space enclosed within it. For example, the volume of a cube is the area of one side times its height. The figure below shows a cube. The area of its base is indicated in color.