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2x + 15 + 3x + 10 = 90°
5x + 25 = 90°
5x = 90° - 25°
5x = 65
x = 65/5
x = 13°
Sudut B = 3x + 10
= 3(13) + 10
= 39 + 10°
= 49°
#SemogaMembantu :)