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An irregular pentagon such as a child's silhouette of a house: a rectangle shape (open at the top) forming the body of the house, with a triangular roof on of the rectangle. The vertical line through the apex of the roof is the line of symmetry. The two walls, and the two roof lines are the two sets of equal sides. The two right angles at the base are the one set of matching angles.
triangle
Pentagon
An equilateral triangle has 3 equal acute angles of 60 degrees and it has 3 lines of symmetry.
An irregular quadrilateral.
corresponding and alternate angles
An irregular pentagon such as a child's silhouette of a house: a rectangle shape (open at the top) forming the body of the house, with a triangular roof on of the rectangle. The vertical line through the apex of the roof is the line of symmetry. The two walls, and the two roof lines are the two sets of equal sides. The two right angles at the base are the one set of matching angles.
hsa
Parallelogram
star
triangle
Pentagon
an equilateral triangle
octagon
Impossible.
Square
An equilateral triangle has 3 equal acute angles of 60 degrees and it has 3 lines of symmetry.