Verified answer

а)

S=a²=15²=225 мм²

V=s×h=225×15=3375 мм²

б)

s=ab=4×3,5=14 см²

V=s×h=14×5=70 см³

в)

s=(1/2)ab=(1/2)×12×5=30 дм²

V=s×h=30×6,5=195 дм³

а)

[tex]s = a {}^{2} = 15 {}^{2} = 225 \: \: mm { }^{2} \\ v = a \times h = 225 \times 15 = 3375 \: \: {mm}^{3} [/tex]

2)

[tex]s = ab = 4\times 3.5 = 14 \: \: {cm}^{2} \\ v = s \times h = 14 \times 5 = 70 \: \: cm {}^{3} [/tex]

3)

[tex]s = \frac{1}{2} ab = \frac{1}{2} \times 12 \times 5 = 30 \: \: dm {}^{2} \\ v = s \times h = 3 \times 6 .5 = 195 \: dm {}^{3} [/tex]