91Ó°ÊÓ

Copy and complete the table for spheres. $$\begin{array}{|l|c|}\hline \text { Radius } & 7 \\ \hline \text { Area } & ? \\ \hline \text { Volume } & ? \\ \hline \end{array}$$

Two cones have radii \(6 \mathrm{cm}\) and \(9 \mathrm{cm} .\) The heights are \(10 \mathrm{cm}\) and \(15 \mathrm{cm} .\) respectively. Are the cones similar?

The heights of two right prisms are \(18 \mathrm{ft}\) and \(30 \mathrm{ft}\). The bases are squares with sides 8 ft and 15 ft, respectively. Are the prisms similar?

Copy and complete the table for spheres. $$\begin{array}{|l|c|}\hline \text { Radius } & 5 \\ \hline \text { Area } & ? \\ \hline \text { Volume } & ? \\ \hline \end{array}$$

Two similar cylinders have radii 3 and \(4 .\) Find the ratios of the following: a. heights \(\quad\) b. base circumferences \(\quad\) c. lateral areas d. volumes

Two similar pyramids have heights 12 and \(18 .\) Find the ratios of the following: a. base areas b. lateral areas c. total areas d. volumes

Copy and complete the table for spheres. $$\begin{array}{|l|c|}\hline \text { Radius } & \frac{3}{4} k \\ \hline \text { Area } & ? \\ \hline \text { Volume } & ? \\ \hline \end{array}$$

The volume of a cylinder is \(64 \pi .\) If \(r=h,\) find \(r\)

Copy and complete the table for spheres. $$\begin{array}{|l|c|}\hline \text { Radius } & ? \\ \hline \text { Area } & 64 \pi \\ \hline \text { Volume } & ? \\ \hline \end{array}$$

Assume that the Earth and the moon are smooth spheres with diameters \(12,800 \mathrm{km}\) and \(3.200 \mathrm{km},\) respectively. Find the ratios of the following: a. lengths of their equators b. areas c. volumes