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Answer:45Step-by-step explanation:in right angled triangle ABCAB=ACangle ACB=angle ABC (angle opposite to equal sides are equal)angle BAC=90therefore , angle ACB+ angle ABC +angle BAC=180angle ACB+ angle ABC+90=180angle ACB+ angle ABC=902(angle ACB)=90angle ACB=90/2angle ACB=45angle ACB=angleABC=45
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