Triangles
Vocabulary 1
Shapes and Lines
Vocabulary 2
Angles
100

The type of triangle with all sides congruent (equal).

What is equilateral triangle?

100

A line in one direction forever.

What is a ray?

100

A shape with 5 sides.

What is a pentagon? 

100

The distance from the center of a circle to the side.

What is the radius?

100

An angle greater than 90 degrees and less than 180 degrees.

What is an obtuse angle?

200

The type of triangle with no congruent (equal) sides or angles.

What is scalene triangle?

200

A line that separates mirrored sides of a shape.

What is a line of symmetry? 

200

This quadrilateral has four sides and ONE set of parallel sides.

What is a trapezoid?

200

The formula for the area of a circle.

What is Pi x r squared?

200

An angle that is 180 degrees.

What is a straight angle?

300

The type of triangle with one angle greater than 90 degrees.

What is an obtuse triangle?

300

A shape that is 3D, open, and has curvy lines.

What is a nonpolygon?

300

Lines that never intersect.

What are parallel lines?

300

The area formula of a triangle.

What is 1/2 x base x height?

300

An angle less than 90 degrees.

What is an acute angle?

400

The type of triangle with one 90 degree angle and two congruent (equal) sides.

Looking for TWO names!

What is a right isosceles triangle?

400

A line between two points.

What is a line segment?

400

Lines that intersect at a 90 degree angle.

What are perpendicular lines?

400
A 2D shape with straight lines and is closed.

What is a polygon?

400

90 degree angle.

What is a right angle?

500

A triangle with three angles less than 90 degrees.

What is an acute triangle?

500

Two angles that add together to make a 90 degree angle.

What are complementary angles?

500

A four sided shape with four right angles and opposite sides are parallel.

What is a rectangle or square?

500

A seven-sided shape.

What is a heptagon?

500

Angle more than 180 degrees.

What is a reflex angle?