Name________________________

 

VOLUME OF A TRIANGULAR PRISM  #1--KEY

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Directions:  Find the volume of each right triangular prism below.  First find the area of the triangular base (1/2 x base x height).  Then multiply this area times the height of the prism.  For example in #1, the base is 5 and the height of the triangle is 6, so ½ x 5 x 6 = 15.  Then multiply this area times the height of the prism, which is 2 inches.

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5 in

 
1)                                                              2)                                                         3)

                                                                                                  

9 in

 

2 in

 

2 in

 
                                                                                                           

3 in

 
 


4 in

 

5 in

 

3 in

 
                                                                                                                                                                                   

 

 

 

Volume =  _______30______     Volume =  _____20________                     Volume =  ____40.5_______

 

 

 

 

5 in

 
4)                                                              5)                                                         6)

                                                                                                  

8 in

 

1 in

 

2 in

 
                                                                                                           

4 in

 
 


7 in

 

6 in

 

4 in

 
                                                                                                                                                                                   

 

 

 

Volume =  _______32______     Volume =  ______15_______                     Volume =  _____112_______

                                                           

7 in

 
7)                                                              8)                                                         9)

                                                                                                  

8 in

 

2 in

 

3 in

 
                                                                                                           

3 in

 
 


6 in

 

7 in

 

3 in

 
                                                                                                                                                                                   

           

                                               

Volume =  _______36______     Volume =  ___73.5______              Volume =  _______36______