Exterior Angle Theorem
The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle.
Area of Square Pyramid
Surface Area = a2 + 2 × a × l Where a is the base edge and l is the slant height.
Central Angle Theorem
The measure of an inscribed angle for a circle is one half the measure of the corresponding central angle.
Sum of the Angles in a Triangle
The angles of a triangle always sum to 180 degrees.