An isosceles triangle has 2 sides of equal length. The angles at the base of the equal sides are equal. The angles inside a shape are called interior angles. The interior angles in a triangle ...

It is a closed 3-sided shape made up of straight lines ... This means that this triangle is isosceles. An isosceles triangle has two sides that are congruent (equal) in length.

These shapes aren't constellations ... both from the constellation Gemini, you get smaller isosceles triangle, with the Red ...