Angles
This angle is exactly 90 degrees.
right angle
This never ends and goes in both directions
has 5 sides of equal length and 5 equal angles
Polygon
The point where two sides of a shape meet is called this.
Vertex
74 x 6
444
This angle is less than 90 degrees
acute angle
A line that has a starting point but goes on forever in one direction.
a ray
round, has no corners, and every point on the edge is the same distance from the center.
Circle
exactly the same in size and shape
Congruent
49 x 7
343
This angle is more than 90 degrees but less than 180 degrees
obtuse angle
A line that has two endpoints and does not go on forever
line segment
This six-sided shape has equal sides and angles of 120°, and is famously seen in honeycombs
hexagon
where two sides are the same length:
Iscoles
593 x 24
14,232
When two lines meet at a point, this is formed
Two lines that cross each other at one point
Intersecting lines
A shape with 4 sides
quadrilateral
where all three sides are the same length.
equilateral
342 x 6
2052
We use this tool to measure angle
Protractor
Lines that never meet, no matter how far they go
parallel lines
A 4-sided shape with only one pair of opposite sides parallel
trapezoid
where all sides are different lengths.
Scalene
87 x 9
783