Lines
Angles
Triangles
Quadrilaterals
More Lines, Angles, etc.
100
A straight path that goes on forever in both directions.
What is a line?
100
The point that two rays of an angle have in common.
What is vertex?
100
Length of their sides or by the measures of their angles.
What are two ways to classify (name) angles?
100
A polygon wtih four sides.
What is a quadrilateral?
100
Triangles are three-sided polygons. These make up each side of the triangle.
What are line segments?
200
Part of a line having only one end point.
What is a ray?
200
An instrument used to measure the size of an angle.
What is a protractor?
200
All angles in this triangle are less than 90 degrees.
What is an acute triangle?
200
This polygon has only one pair of parallel sides.
What is a trapezoid?
200
A triangle with two equal sides and one angle greater than 90 degrees.
What is an isosceles or obtuse triangle?
300
Lines that never cross even if they are extended.
What are parallel lines?
300
An angle measures that measures less than 90 degrees.
What is an acute angle?
300
This triangle has at least two sides of the same length.
What is an isosceles triangle?
300
This polygon has two pairs of parallel sides and all sides are the same length. The angles are acute and obtuse.
What is rhombus?
300
A plane, closed figure formed by line segments.
What is a polygon?
400
Two lines that from square corners where they cross.
What is perpendicular?
400
This angle is more than 90 degrees.
What is an obtuse angle?
400
A triangle where no sides are the same length.
What is a scalene triangle?
400
This polygon has 4 equal sides and 4 right angles.
What is a square?
400
Where two lines cross.
What is an intersection?
500
A point at the end of a ray.
What is an end point?
500
An angle that measures exactly 90 degrees.
What is a right angle?
500
A triangle that has all sides the same length.
What is an equilateral triangle?
500
A polygon that has opposite sides parallel and the same length. It also has 90 degree angles.
What is a rectangle?
500
A 5-sided polygon shaped building in Washington, D.C. that houses government security agencies.
What is the Pentagon?
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