10. The volume of the triangular prism is [tex] V=A_{base}\cdot H=\dfrac{1}{2} height \cdot base\cdot H [/tex], then
[tex] V=\dfrac{1}{2} \cdot 4\cdot 3.5\cdot 3.3=23.1 [/tex].
11. The volume of the triangular pyramid is [tex] V=\dfrac{1}{3}A_{base}\cdot H=\dfrac{1}{3}\cdot \dfrac{1}{2} height \cdot base\cdot H [/tex], then
[tex] V=\dfrac{1}{3}\cdot \dfrac{1}{2} \cdot 4\cdot 3.5\cdot 3.3=7.7 [/tex].
12. They have common base (common triangle). y=7.7, r=23.1, then r:y=23.1:7.7=3.
13. See 10 and 11 for notations in symbols.
