it's a triangle (three sides) with two sides having equal lengths and angles
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The description given could be that of an isosceles trapezoid * * * * * No it could not. An isosceles trapezoid has two pairs of equal angles. The correct answer is a kite or arrowhead.
An isosceles triangle is a triangle (3-sided, 2-dimensional shape), 2 sides of which are equal in length. Any triangle which is not equalateral
isosceles triangle
An isosceles triangle.
12-sided two dimensional shape: dodecagon12-sided three dimensional shape: dodecahedron