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					 Height of a prism–shaped part of a machine is 8 cm and its base is an isosceles triangle, whose each of the equal sides is 5 cm and remaining side is 6 cm. The volume of the part is
 
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                        -  96 cu. cm 
 
-  120 cu. cm 
 
-  86 cu. cm 
 
- 90 cu. cm
 
-  96 cu. cm 
Correct Option: A

AB = AC = 5 cm. 
BD = DC = 3 cm. 
From ∆ABD, 
AD = √AB² - BD² = √5² - 3² = √25 - 9 
= √16 = 4 cm. 
| ∴ Area of the base of prism = | × BC × AD | |
| 2 | 
| = | × 6 × 4 = 12 sq. cm. | |
| 2 | 
∴ Volume of prism = Area of base × height = 12 × 8 = 96 cu. cm.
 
	