I need this done today whoever gets this correct gets brainliest!!! PLZZ HELPP MEE!!!
hurryy

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