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Home > GC > Chapter 9 > Lesson 9.2.4 > Problem 9-89


Find the volumes of the solids below.  

  1. cylinder

    A 10 units diameter cylinder with a height of 21 units.

    Recall the formula for the volume of a cylinder.

  1. regular octagonal prism
    A regular octagonal prism with a side length of 2 feet and a height of 7 feet.

    Divide the octagonal base into congruent triangles to find its area.

    Now use the formula to find the volume of the prism.