An obtuse angle
If one angle is a right angle, it is a right triangle. If one angle is an obtuse angle, it is an obtuse triangle. If there are no right nor obtuse angle then it is an acute triangle.
An obtuse triangle.
Obtuse Angle
any triangle can contain at most 1 obtuse angle. it is called an obtuse triangle.
It is an obtuse triangle if its 2 other acute angles are different in sizes.
It is an obtuse scalene triangle
Every triangle must have at least two acute angles. The third one can be acute, right (90 degrees), or obtuse.
An obtuse angled triangle.
No plane triangle can have only one acute angle.
An obtuse angled triangle.
An obtuse triangle.