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dijawab dua-duanya deh

(2x + 7)° + 90° + (x + 11)° = 180°
(2x + 7)° + (x + 11)°           = 90°
(3x + 18)°                           = 90°
3x                                       = 90 - 18
                                           = 72°
x                                         = 24°

sudut (2x + 7)°  = 2(24) + 7
                         = 55°

sudut (x + 11)° = 24 + 11
                        = 35°