If all side lengths are changed so the new shape is proportionately equal, the angles don't change. But if it's not proportion. equal, then the angles will be different
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A rhombus
If each angle is 90 degrees the shape is called a square.
There is no such thing as an equilateral angle. Equilateral refers to a shape whose sides are of equal length. The lengths of the sides of an angle are indeterminate.
trapzoid
It is an isosceles triangle; and if it has a 90 degree angle and two 45 degree angles then it is an isosceles right angle triangle.