In mathematics, an obtuse angle is defined as an angle greater than 90° and less than 180°.
A right angle is 90°. An acute angle is greater than 0°, but less than 90°.
Therefore, a 90° right angle plus any acute angle will always fulfill the requirements of an obtuse angle.
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A rhombus for example has 2 equal acute and 2 equal obtuse interior angles that add up to 360 degrees
two equal acute angles are formed.
There are two equal acute angles. The third angle can be acute, right or obtuse.
Only when it has 2 equal acute angles and 1 obtuse angle that it is an isosceles triangle
Not necessarily. The two equal angles in an isosceles triangle must both be acute angles. If they were right angles or obtuse angles then a triangle could not be formed. If the two equal angles are less than 45° each then the third angle is an obtuse angle. If they are both 45° then the third angle is a right angle and if they are both greater than 45° then the third angle is an acute angle.