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b. 20^2 + 21^2 = 400 + 441 = 841 = 29^2 (bukan 28^2) ------ salah
c. 36^2 + 78^2 = 1296 + 6.084 = 7380 = 85,90^2 (bukan 85^2) ----- salah
d. 48^2 + 55^2 = 2304 + 3025 = 5329 = 73^2 ------ benar
jadi jawabannya d. 48, 55, dan 73