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90 - 47 = 43 derajat
90 - 78 = 12 derajat
90 - 89 = 1 derajat
x = 90 - 23
x = 67°
b. 47 + x = 90
x = 90 - 47
x = 43°
c. 78 + x = 90
x = 90 - 78
x = 12°
d. 89 + x = 90
x = 90 - 89
x = 1°