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  1. 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
    1. 96 cu. cm
    2. 120 cu. cm
    3. 86 cu. cm
    4. 90 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 =
1
× BC × AD
2

=
1
× 6 × 4 = 12 sq. cm.
2

∴ Volume of prism = Area of base × height = 12 × 8 = 96 cu. cm.



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