Triangles by Sides
This type of triangle has 3 equal sides.
What is an equilateral triangle?
This type of triangle has one angle that measures exactly 90 degrees.
What is a right triangle?
A polygon is a closed shape with sides made of these.
To be called "regular," a polygon must have all sides equal and all of these equal?
What are angles?
This is the term used to describe two shapes that match exactly.
what is congruent?
This type of triangle has 2 equal sides and 1 line of symmetry
What is an isosceles triangle?
In this type of triangle, all three angles are less than 90 degrees.
What is an acute triangle?
This is the name for a polygon with 8 sides
What is an octagon?
This is the special name for a "regular triangle".
What is an equilateral triangle?
The mathematical symbol for congruent.
This type of triangle has no equal sides and no lines of symmetry
What is a scalene triangle?
This type of triangle has one angle that is greater than 90 degrees.
What is an obtuse triangle?
This type of polygon has at least one angle that is greater than 180 degrees.
what is a concave polygon?
This is the special name for a "regular quadrilateral".
What is a square?
One way to check for congruency is to use this type of paper to see if one shape fits exactly over the other.
What is tracing paper?
These are the small symbols on a drawing to show that sides are equal in length
What are hatch marks?
True or false: A triangle can have more than one obtuse angle
In this type of polygon, every single interior angle is less than 180 degrees
If a hexagon has some sides that are 5cm and some that are 7cm, it is classified as this type of polygon.
What is an irregular polygon?
when you place one shape directly on top of another and they match exactly, we say the do this.
What is coincide (or superimpose)
Because the sum of angles in a triangle is 180, every angle angle in an equilateral triangle must be this many degrees.
what is 60
Every triangle, regardless of its name, must have at least this many acute angles.
What is 2?
This is the specific name for a point where exactly two sides of a polygon meet
What is a vertex?
A regular hexagon has this many lines of symmetry.
what is six?
To prove two regular polygons are congruent without moving them, you must show their side lengths are equal and these are also equal.
what are their angle measures?