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A shape with nine sides is called a nonagon.
a icosakainonagon
An equilateral triangle is a triangle with all sides the same length.
A regular polygon
Parallelograms and squares.
A shape with nine sides is called a nonagon.
The kind of triangle with two sides the same length is an isosceles triangle.
A parallelogram has both pairs of opposite sides parallel but no right angles. A special kind of parallelogram is a rhombus which has all its sides of equal length
Square.
a icosakainonagon
An equilateral triangle is a triangle with all sides the same length.
A hexagon has six sides. It also has six corners. It looks like this:
That's a trapezoid.
An isosceles triangle is a triangle that has two sides of equal length.
It is a quadrilateral because it has 4 sides
A regular polygon
Parallelograms and squares.