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Step-by-step explanation:
[tex]a \: = \frac{1}{2} \times 5 \times 4 \\ area \: \:of \: base = 10cm {}^{2} \\ volume \: = \frac{1}{3} \times a \: \times h \\ = \frac{1}{3} \times 10 \times 15 \\ = 50 cm {}^{2} [/tex]