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L = (20×5) + (5×5) = 100 + 25 = 125 cm²
2. K = 40+68+42 = 150 cm
L = 42-10 = 32 ÷ 2 = 16
= 16 × 30 = 480 cm²
= 10 × 15 = 150 cm²
= 480+150 = 630 cm²
3. K = 22/7 × 42 = 22 × 6 = 132 ÷ 2 = 66 cm
= 42×4 = 168-66 = 102 cm
L = 22/7 × 21² = 22/7 × 441 = 22×63
= 1386 ÷ 2 = 693 cm²
= 42 × 42 = 1764 - 693 = 1071 cm²
4. K= 24+32 = 56 cm
L= 12×8 = 96 cm²
= 9×8÷2 = 36 cm²
= 96+36 = 132 cm²
5. Maaf yang ini saya jadi bingung:-\