Bantuin dong.... pake cara
Jawaban:
PERSEGI
1. • s = 10 cm
• k = 4 × s = 4 × 10 = 40 cm
• l = s × s = 10 × 10 = 100 cm²
2. • k = 56 cm
56 = 4 × s
56/4 = s
14 = s
• l = s × s = 14 × 14 = 196 cm²
3. • l = 441 cm²
441 = s²
√441 = s
21 = s
• k = 4 × s = 4 × 21 = 84 cm
PERSEGI PANJANG
1. • p = 5 cm
• l = 8 cm
• k = (2×p)+(2×l) = (2×5)+(2×8) = 10+16 = 26 cm
• L = p×l = 5×8 = 40 cm²
2. • p = 6 cm
• L = p×l
42 = 6×l
42/6 = l
7 = l
• k = (2×p)+(2×l) = (2×6)+(2×7) = 12+14 = 26 cm
3. • l = 9 cm
• k = 38 cm
38 = (2×p)+(2×l)
38 = (2×p)+(2×9)
38 = (2×p)+18
38-18 = 2×p
20 = 2×p
20/2 = p
10 = p
• L = p×l = 10×9 = 90 cm²
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