In the instance of a triangle it is equilateral. Most quadrilaterals have equal sides as well (such as a rectangle with two sets of equal sides).
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2 equilateral triangles
A triangle with two equal sides and two equal angles is called an isosceles triangle.
A kite, and various options amongst polygons with 5 or more sides.
Not necessarily. A triangle with two equal sides is called an isoceles triangle. A right triangle has one angle that measures 90 degrees.
The shape can only be a rectangle! A rectangle is a four-sided 2-dimentional figure, where every angle is a right angle, opposite sides are parallel, but the 4 sides are NOT equal.