Learn the definitions. Any angle greater than 90º is obtuse. Two angles are congruent if and only if they are equal. For example, 105º ≠ 150º, but both are greater than 90º; therefore, they are not congruent. Obtuse, fersure!
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Yes, a rhombus can have both acute and obtuse angles. A rhombus is a quadrilateral with all sides of equal length, but its angles can vary. Since the opposite angles of a rhombus are congruent, if one angle is acute (less than 90 degrees), then the opposite angle will also be acute. Similarly, if one angle is obtuse (greater than 90 degrees), then the opposite angle will also be obtuse.
No. Except for the case of a square (a special case of rhombus), a rhombus will have 2 congruent acute angles, and 2 congruent obtuse angles. The square has 4 right angles. In fact, every quadrilateral will have either all 4 angles equal to right angle (square and rectangle), or will have at least 1 obtuse angle (also at least 1 acute).
Because it has five angles it is a irregular pentagon.
A rectangle has no interior obtuse angles.
There are no angles they are all obtuse angles