+0  
 
+1
86
1
avatar+545 

winkwinkwink

thank you in advance

lynx7  Apr 12, 2018
 #1
avatar+87639 
+2

The area  of the base is given by

 

(1/2) AB * AC  sin (90)  =   AB * AC / 2    =  x * x  / 2  = x^2 / 2

 

The height is AD  = 2AB  =  2x

 

So.......using the formula

 

72  =  (1/3)  base area * height     ....   subbing the above, we have

 

72 = (1/3) [x^2/2] * [2x]

 

72 = (1/3) [ x^3]        multiply  both sides by 3

 

216  =  x^3         take the cube root of both sides

 

6 (cm)   = x

 

 

cool cool cool

CPhill  Apr 12, 2018

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