Question

Volume and Surface Area

Answer 1

1 )

$volume = 20 \times 5 \times 8$

$volume = 800 \: \: {m}^{3}$

$surface \: \: area \: = 4 \times 20 \times 8$

$surface \: area \: \: = 640 \: \: {m}^{2}$

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2 )

$v = 15 \times 3 \times 4$

$v = 180 \: \: {m}^{3}$

$s \: a \: = 4 \times 15 \times 4$

$s \: a \: = 240 \: \: {m}^{2}$

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3 )

$v = ( \frac{1}{2} \times 4 \times 5) \times 10$

$v = 100 \: \: {m}^{3}$

$s \: \: a = (10 \times 5) + (10 \times 4) + (10 \times \sqrt{41} )$

$s \: a \: \: = 50 + 40 + 10 \sqrt{41}$

$s \: a \: \: = 90 + 10 \sqrt{41}$

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4 )

$v = ( \frac{1}{2} \times 3 \times 4) \times 7$

$v = 42 \: \: \: {m}^{3}$

$s \: a \: \: = (3 \times 7) + (4 \times 7) + (5 \times 7)$

$s \: a \: \: = 21 + 28 + 35$

$s \: a \: \: = 84 \: \: \: {m}^{2}$