Respuesta :

BORNLEADER14

Answer:

FIRST ONE IS WRONG AND THE LAST TWO ARE CORRECT

Explanation:

A+B=90 IS WRONG ITS 180

90+B=180 IS RIGHT BECAUSE ITS 90 + A 90 DEGREE ANGLE

180-B=A IS CORRECT BECAUSE B IS 90 SO 180 - 90 = A. A=90

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