Classifying Two Dementional Shapes

This post is longer, but crammed with helpful information! Happy learning!

When we are classifying two dimensional shapes, there are a couple thing we have to keep in mind.

1. How many sides does it have?
2. Are the sides equal?
3. Are the sides parallel? 
4. What are the angles of the corners?

Below I will address two kinds of lines and have a quick review of angles from our last lesson. 

Lines

Perpendicular: two lines that cross at a 90 degree angle.

• Think of a addition sign. 

Parallel: lines on a plain that are always the same distance apart. 

• They will NEVER touch.

P and P Lines Video

Angles

Right angle: 90 degrees (Think of the letter L)

Acute angle: less than 90 degrees (Think "it's a cute little angle")

Obtuse angle: larger than 90 degrees (Think BIG angle)

Angle Video

Types of shapes we will cover

Polygon: a closed, flat shape with all straight sides.

• Basically any shape that is not a circle.

Acute Triangle: Three acute angles

Right Triangle: One right angle

Obtuse Triangle: One obtuse angle

Equilateral Triangle: Three equal sides

Isosceles Triangle: Two equal sides

Scalene Triangle: Zero equal sides

A Blooket to review! Triangle Review