If the side of a triangle is extended, the angle formed outside the triangle is the exterior angle. \(g\) is the interior angle. \(h\) is the exterior angle. \(g + h = 180^\circ\) The interior ...

Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a half turn (180˚). Quadrilaterals close ...