The angles inside a shape are called interior angles. If the side of a triangle is extended, the angle formed outside the triangle is the exterior angle.

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 ...

👉 Learn how to solve for an unknown variable in the exterior angle of a polygon. The exterior angle of a polygon is the angle between a side of the polygon and an outward extension of the adjacent ...

👉 Learn how to find a missing angle of a right triangle. A right triangle is a triangle that has 90 degrees as one of its angles. The trigonometric identities of right triangles give us the ...