cone, cylinder, prism, sphere, surface area, volume
TEKS 8(1)(A), 8(7)(A)
Example Finding Surface Areas of Composite 3-D Figures
The party favors have the shape of 2 identical cones attached at their bases. The base radius is 2 in. To the nearest cubic inch, how much confetti do you need to fill each party favor? Use 3.14 for π.
Find the amount of confetti needed to fill the party favor by calculating the volume of one cone and doubling it.
Step 1 Find the volume of one cone.
Since the double cone is 10 in. long, the height of one cone is 5 in.
table with 4 rows and 2 columns , row1 column 1 , v , column 2 equals , 1 third , pi , r squared , h , row2 column 1 , , column 2 equals , 1 third , pi . open 2 close squared . open 5 close , row3 column 1 , , column 2 equals , 1 third , pi open 20 close , row4 column 1 , almost equal to 21 , end table