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1. The base of a right prism is a trapezium whose lengths of two parallels sides are 10 cm and 6 cm and distance between them is 5 cm. If the heights of the prism is 8 cm, its volume is :

A. 320 cm³

B. 300 cm³

C. 310 cm³

D. 300.5 cm³

Solution:

Length of parallel sides of prism = 10 cm and 6 cm
Height of prism = 8 cm
∴ Volume of prism :

\begin{aligned} = \frac{1}{2} (10 + 6) \times 5 \times 8 \\ = \frac{1}{2} \times 16 \times 5 \times 8 \\ = 320 c m^{3} \end{aligned}

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