An isosceles triangle has three sides, two of which are exactly equal in length.
it's a triangle (three sides) with two sides having equal lengths and angles
An isosceles triangle.
A three sided polygon in which two sides are equal in length and two angles are equal in size.
It is impossible to have a two-sided regular polygon with equal length sides. The two sides would merely form an open angle, with no closed third side.
A pentagon is a five sided two-dimensional object. A regular pentagon would have all five sides and angles equal.
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An isosceles triangle
Isosceles Triangle.
An isosceles triangle has three sides, two of which are exactly equal in length.
A 3 sided polygon with 2 equal sides is an isosceles triangle
It isn't really a square if it has no equal sides. A trapezoid can be drawn that has no equal sides, some can have two sides equal. Quadrilaterals include those 4-sided shapes with no sides equal but they also include all other 4-sided shapes. You would need to specify "Quadrilateral with no equal sides".
A two-dimension shape with eight sides is an octagon. A three-dimensional object with eight sides is an octahedron.
it's a triangle (three sides) with two sides having equal lengths and angles
well a regular pentagon has 5 equal sides, so it has two equal sides? But I can also create a pentagon with exactly 2 equal sides? Not sure what you are looking for? Well, any 5 sided shape is a pentagon. And like the above states, a pentagon with exactly 2 equal sides can be created. So, the is a pentagon.
An isosceles triangle.
A three sided polygon in which two sides are equal in length and two angles are equal in size.