Math Vocab.
Types of Triangles (pictures)
Types of Angles
Name that Polygon
Types of Triangles
100

Two lines that going in the same direction forever and will never cross. 

Parallel 

100

Name this triangle based on it's sides.

Equilateral

100

acute angle

100

Polygons with four sides and four vertices

quadrilateral

100

Triangles that have all sides equal

equilateral

200

Two lines that connect at a 90 degree angle. 

Perpendicular 

200

Name this triangle based on it's sides.

Isosceles

200

obtuse angle

200

Polygons with three sides and three vertices

triangle

200

Triangles that have NO equal sides

scalene triangle

300

A shape that only has one set of parallel lines 

trapezoid 

300

Name this triangle based on it's angles.

Right triangle

300

Which angle has exactly 90 degrees.

right angle

300

Polygons with five sides and five vertices

pentagon

300

Triangles that have two equal sides

isosceles 

400

Any shape in which all sides and all angles are congruent. 

Regular 

400

What type of triangle has 1 angle that is greater than 90 degrees?

Obtuse triangle

400

An angle that is 172 degrees is an _________ angle.

obtuse

400

Polygons with six sides and six vertices

hexagon

400

Triangles that have three angles less than 90 degrees

acute triangle

500

What three rules must a shape follow to be a polygon?

1. Must be a closed shape

2. Must have straight lines.

3. Lines cannot cross. 

500

Name this triangle based on it's angles.

acute triangle

500

An angle that is 89 degrees is a ___________ angle.

acute

500

Polygons with eight sides and eight vertices

octogon

500

Triangles that have one angle greater than 90 degrees

obtuse