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90° = x² + (2x-3)²
90 = x² + 2x² + 9
90-9 = x²+2x²
81= 3x²
x² = 81/3
x²= 27
jadi, sudut yang paling besar = 2x²+9 = 2.27 + 9 = 63
jawabannya c. 63
maaf kalau salah