Question

What triangle is this acute, obtuse or right angles triangle and how?

Answer 1

Hi!

In the above diagram, angle B= 20 degree and angle C= 30 degree, then, angle A=180-( 20+ 30)=180-50= 130. Therefore, the triangle has an obtuse angle and it is an obtuse triangle.(Obtuse because 1 angle of the triangle is more than 90 degree but less than 180 degree.)

{Hope this helps}
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