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<a = 2 x <b
substitusi <a = 2 x <b
* 2 x<b + <b = 90 °
3 x <b = 90°
<b = 90/3 = 30°
** <a + 30° = 90°
<a = 90° - 30° = 60°
Jadi, sudut a = 60° dan sudut b = 30°