a) nilai a
= 40 - 10 cm
= 30 cm
b) luas permukaan
= 2(40×15) + 40×10 + 3(15×10) + 10×10 + 2(15×30) + 30×10
= 2×600 + 400 + 3×150 + 100 + 2×450 + 300
= 1200 + 400 + 450 + 100 + 900 + 300
= 3350 cm²
c) volume
= 40×10×15 + 30×10×15
= 6000 + 4500
= 10500 cm³
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a) nilai a
= 40 - 10 cm
= 30 cm
b) luas permukaan
= 2(40×15) + 40×10 + 3(15×10) + 10×10 + 2(15×30) + 30×10
= 2×600 + 400 + 3×150 + 100 + 2×450 + 300
= 1200 + 400 + 450 + 100 + 900 + 300
= 3350 cm²
c) volume
= 40×10×15 + 30×10×15
= 6000 + 4500
= 10500 cm³