That would be called a right triangle!
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It is an isosceles triangle having 2 equal angles of 30 degrees and an apex angle of 120 degrees
You need the measures of two sides and for the triangle to be a right triangle to figure out the third side.
No because the sum of the 2 smaller sides of a triangle must be greater than its longest side in order to construct a triangle.
A protractor is used for measuring angles and the 3 angles in a triangle add up to 180 degrees.
-- If one of the triangles' angle measures is 90 degrees, than it is a right triangle. -- If two of the triangle's angles add up to 90 degrees, then it's a right triangle. -- If the squares of the lengths of two sides add up to the square of the length of the third side, then it's a right triangle.