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