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Definitions
Angles
Triangles
Shapes
Other
100
This is formed by 2 rays or 2 line segments that share the same endpoint.
What is an angle?
100
An angle that is larger than 90 degrees and less than 180 degrees.
What is an obtuse angle?
100
A triangle which has three equal sides.
What is an equilateral triangle?
100
A shape that has four sides.
What is a quadrangle?
100
What you should do first before measuring an angle.
What is 'identifying the angle'?
200
In angle ABC, the B is this.
What is the vertex?
200
This shape always measures a total of 180 degrees.
What is a triangle?
200
This prefix means 'three'.
What is 'tri'? (e.g. triangle)
200
A polygon whose sides all have the same lengths and whose angles are all the same size.
What is a regular polygon?
200
The total degrees in a circle.
What is 360 degrees?
300
A tool used to measure angles in degrees.
What is a protractor?
300
An angle that measures larger than 180 degrees and less than 360 degrees.
What is a reflex angle?
300
A triangle whose sides are all different lengths.
What is a scalene triangle?
300
A shape that has 9 sides.
What is a nonagon?
300
The plural word for vertex.
What is 'vertices'?
400
A flat, 2-dimensional figure made up of lines segments called sides.
What is a polygon?
400
Angles that are next to each other...'neighbors'.
What are adjacent angles?
400
A triangle that has two sides of the same length.
What is an isosceles triangle?
400
A polygon in which all the sides are pushes outward.
What is a convex polygon?
400
Lines that meet.
What are intersecting lines?
500
Angles that are opposite of each other when two lines intersect.
What are vertical angles?
500
Angles which have the same degree measure.
What are congruent angles?
500
A triangle which has one right angle. (square corner)
What is a right triangle?
500
A polygon in which at least two sides are pushed in.
What is a concave polygon?
500
Lines on a flat surface that will never meet.
What are parallel lines?