The only type of triangle that has three equal sides is an equilateral triangle. 

A right triangle has to have a right angle, which is equal to 

The two-dimensional figure shown in the image is a pentagon. A pentagon is classified by having five sides, five angles, and five vertices. A pentagon has interior angles that add to 540 degrees. Regular pentagons have sides of equal length and interior angles of 108 degrees.

The two-dimensional figure in the question is a quadrilateral. A quadrilateral is a four-sided shape, has four angles and four vertices. More specifically, this type of quadrilateral can be called a trapezoid or parallelogram.

The two-dimensional shape in the image is a heptagon. A heptagon has seven sides, seven angles, and seven vertices. The sum of the interior angles is 900°.

When you are trying to decide if a line represents a line of symmetry you can think about folding the figure across that line. Once you make the fold, do all of the parts line up on top?

If yes, then the line represents a line of symmetry. 

If no, then the line does not represent a line of symmetry. 

These lines represent lines of symmetry because if you fold on the black lines, then one side would lay on top of the other and the parts would match up. 

When you are trying to decide if a line represents a line of symmetry you can think about folding the figure across that line. Once you make the fold, do all of the parts line up on top?

If yes, then the line represents a line of symmetry. 

If no, then the line does not represent a line of symmetry. 

This line represents a line of symmetry because if you fold on the black line, then one side would lay on top of the other and the parts would match up. 

When you are trying to decide if a line represents a line of symmetry you can think about folding the figure across that line. Once you make the fold, do all of the parts line up on top?

If yes, then the line represents a line of symmetry. 

If no, then the line does not represent a line of symmetry. 

These lines represent lines of symmetry because if you fold on the black lines, then one side would lay on top of the other and the parts would match up. 

When you are trying to decide if a line represents a line of symmetry you can think about folding the figure across that line. Once you make the fold, do all of the parts line up on top?

If yes, then the line represents a line of symmetry. 

If no, then the line does not represent a line of symmetry. 

These lines do not represent lines of symmetry because if you fold on the black lines,  one side will not lay on top of the other with parts that match up. 

When you are trying to decide if a line represents a line of symmetry you can think about folding the figure across that line. Once you make the fold, do all of the parts line up on top?

If yes, then the line represents a line of symmetry. 

If no, then the line does not represent a line of symmetry. 

This line does not represents a line of symmetry because if you fold on the black line,  one side will not lay on top of the other with parts that match up.