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"
Play this game for more!