Jawaban:

1. 16 × 20/2(pakai rumus layang²)

=160cm²

2. 20 × 8(pakai rumus jajargenjang)

=160cm²

3. 12 × (18+(18+5+5))/2(pakai rumus trapesium)

=6 × 46

=276cm²

4. 30 × 15 + 15 × 15(rumus persegi panjang+persegi)

= 450+225

= 675cm²

5. 18×18/2 + (18/2) × (9+18)/2(rumus belah ketupat+trapesium)

=162 + 9×27/2

=162+121,5

=283.5cm²

6. 5×12/2 + (12+2)×10(rumus segitiga+jajargenjang)

=30+140

=170cm²

7. 10×5 + 18×5 + (18-10)×10(rumus persegi panjang)

=50+90+80

=220cm²

8. 24×32/2 + 16×(12+24)/2(rumus layang²+trapesium)

=384+288

=672cm²

9. 16×12/2 + 12×32/2(rumus layang2+belah ketupat)

=96+192

=288cm²

10. 10×15/2 + 5×5 + 5×5 + 15×15(rumus segitiga+persegi)

= 75+25+25+225

= 350cm²

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