Relate plane figures to solid figures
Objectives
Student will be able to:
relate plane figures to solid figures.
Introduction
These flat figures are called plane figures.
These shapes are called solid figures. Some of the sides of solid figures are plane figures.
Examples
1.
This solid figure is called a rectangular prism.
How many flat sides does the prism have?
Count the flat sides
top and bottom - 2
sides - 2
back and front - 2
The rectangular prism has 6 flat sides.
Trace the flat side on the front of the prism.
What flat shape did you draw while tracing?
If you trace any of the sides on the prism you will draw a rectangle.
This figure has 6 flat sides that are rectangles.
2.
This solid figure is a cylinder.
How many flat sides does the cylinder have?
The only flat sides on the cylinder are the top and the bottom.
The cylinder has 2 flat sides.
The top and the bottom of the cylinder are the same shape.
What shape is the top of the cylinder?
The top of the cylinder is a circle.
The bottom of the cylinder is also a circle.
The cylinder has two flat sides that are circles.
3.
A sphere is shaped like a ball and has no flat sides.
There are no flat sides to trace. If the sphere were flattened, what plane figure would it look like?
Use your imagination to picture the flattened sphere.
If the sphere were flattened, it would look like a circle.
Try Together
Complete the exercises.
1.
This solid figure is called a cone. What is the shape of the bottom of the cone?
a circle
2.
How many flat sides does the cone have?
one
3.
Trace the flat front of this cube. What shape did you draw?
a square
4.
Circle the correct shape.
I have 6 flat sides, all of which are squares.
Please evaluate the student's answers:
Excellent
Good
Okay