In a right-angled triangle ABC, angle C is straight. Find the angle B if AB = 12, BC = 6.

According to the property of a right-angled triangle: if in a right-angled triangle the leg (side BC) is half the hypotenuse (side AB), then an angle of 30 ° lies opposite it.

This means that the angle A = 30 °.

Now we can find the angle B:

Angle B = 90 ° – 30 ° = 60 °

Answer: angle B = 60 °

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