1.

Two solid right cones of equal height and of radii r

A. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4R </center></td></tr><tr><td style="text-align: center;">r<sub>1</sub> + r<sub>2</sub> </td></tr></table>
B. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4R</center></td></tr><tr><td style="text-align: center;">r<sub>1</sub> + r<sub>2</sub></td></tr></table>
C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4R </center></td></tr><tr><td style="text-align: center;">r<sub>1</sub> + r<sub>2</sub> </td></tr></table>
D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>R </center></td></tr><tr><td style="text-align: center;">r<sub>1</sub> + r<sub>2</sub> </td></tr></table>
Answer» D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>R </center></td></tr><tr><td style="text-align: center;">r<sub>1</sub> + r<sub>2</sub> </td></tr></table>


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