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This guide teaches you how to solve the surface area and volume of different polyhedrons such as prisms, pyramids. How to Solve for the Surface Area and Volume of Prisms and Pyramids.Triangle BCQ is equiangular and, therefore, equilateral.ġ9. The sum of the measures of the angles of a triangle is equal to 180.ġ9. Definition of the Median of a Triangleġ6. The Line Postulate/Definition of Median of a TriangleĦ. Construct side CQ, the median to the hypotenuse side AB.ģ. Every segment has precisely one midpoint.ģ. Right triangle ABC with angle A=30°, angle B=60°, and angle C=90°.Ģ. 30-60-90 Triangle Theorem Detailed Proof Statementsġ.