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4x + 18 = 90
4x = 72
x = 18
besar penyiku ABD yaitu = sudut CBD
= 3x -10
= 54 -10
= 44 (B)
(x + 28)° + (3x - 10)° = 90°
x + 3x + 28° - 10° = 90°
4x + 18° = 90°
4x = 90° - 18°
4x = 72°
x =
x = 18°
Besar ∠ABD:
(18 +28)° = 46°
Semoga Membantu :)