A right-angled triangle.
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A right triangle because the 90 degree angle creates a corner.
A right triangle because all triangles equal 180 degrees. 180-60=120 120-30=90
An obtuse triangle is a triangle that has one angle greater than 90 degrees.
A right triangle has a 90 degree angle in it. This is not to be confused with a wrong triangle, which has two 90 degree angles.
It is a right angle triangle because it has a 90 degree angle and the 3 angles add up to 180 degrees.