A scalene triangle.
A 7 sided solid shape is called a heptagon. Heptagons are used in geometry and they have equal sides and angles.
A heptagon or a septagon. Equal-sided shapes are called "regular" so a seven equal sides shape is a regular heptagon.square square
A non-descript four sided figure is a quadrilateral.
this shape is called a trapizoid see heres a picture!
an equal sided triangle
A square is a four-sided shape with all sides equal and all angles equal.
A FIVE sided shape (called a pentagon) has FIVE sides. Hence "FIVE" sided shape.