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sdt 4 = sdt 3 benar sebab
sdt 1 + sdt 4 =90 (siku2) begitu juga sdt 2 + sdt 3 = 90 (siku2)
sdt 4 = 90 - sdt 1 = 90 - 52
sdt 3 = 90 -sdt 2 = 90-52
sdt 4 = 90 - 52 = sdt 3 = 90 - 52
jadi sdt 4 = sdt 3