1st Grade Math

Geometry

Unit 4


How do we differentiate between shapes?

There are several things something needs to have to be a specific shape. These include the number and length of the sides and the number of angles. Angles are formed when two sides meet!

Basic 2-Dimensional (2D) Shapes

2D shapes are flat shapes

Tip: Parallel means side by side at the same angle

Triangle:

3 sides, 3 angles

Square: 4 EQUAL sides, 4 EQUAL angles

Rectangle: 4 sides, 4 EQUAL angles

Circle: 0 sides, 0 angles

Oval: 0 sides, 0 angles (a stretched circle)

Trapezoid: 4 sides (2 of them parallel)

The shapes below are named for the number of sides they have!

Hexagon: 6 equal sides, 6 equal angles

Heptagon: 7 equal sides, 7 equal angles

Octagon: 8 equal sides, 8 equal angles

Basic 3-Dimensional (3D) Shapes

3D shapes pop off the page and can be held!

Try to identify which 2D figure(s) these 3D shapes correlate (are related) with!

Triangular Prism

Cube

Rectangular Prism

Triangular Prism

Triangle and Rectangle

Cube

Square

Rectangular Prism

Rectangle

Sphere

Cone

Cylinder

Sphere

Circle

Cone

Circle and Triangle

Cylinder

Circle and Rectangle

Play this game to learn more about 3D shapes!

Tip: A vertex is a "point" on the shape; a face is a "side of the shape"