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4s = 40
s = 10
ds = s√2
ds = 10√2
ds = √100 x √2
ds = √200
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24. 8² + x² = (3x)²
64 + x² = 9x²
9x² - x² = 64
8x² = 64
x² = 8
x = √8 = 2√2
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25. ds = s√2
ds = 3√2
ds = √9 x √2
ds = √18
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26. K = 36
4s = 36
s = 36/4 = 9
ds = s√2
ds = 9√2
ds = √81 x √2
ds = √162
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27. D. 7, 24, 25
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28. c² = a² + b²
20² = a² + a²
400 = 2a²
a² = 400/2
a² = 200
a = √200
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29. C. 2 dan 3