Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a ...

A quadrilateral is inscribed in a circle; all four vertices contact the circumference. The measure of angle θ = 110.6106942°. Side a = 2(x + 4), side b = 4x − 1, side c = 4(x + 1) and side d = 3(x + 1 ...