A right triangle.
Providing it has no right angles then it is a scalene triangle.
It looks like a square with a triangle on top of it.
Right triangle. Two angles are 45 degrees, and the third angle is 90 degrees. Two sides are equal.
A rectangle is a four sided polygon with four right angles and two pairs of parallel side. [Equal sides is not required since it is implied by parallel and right angles].
A right trapezoid is a four-sided polygon with two right angles and two parallel sides.
A right [angled] trapezium.
square or rectangle.
A right triangle.
Providing it has no right angles then it is a scalene triangle.
A four-sided polygon with all sides equal and no right angles would be a rhombus. A rhombus consists of two acute angles and to obtuse angles.
That is a rectangle.
It looks like a square with a triangle on top of it.
An irregular pentagon is a polygon that has five sides and two right angles. A regular polygon on the other hand does not have right angles.
Right triangle. Two angles are 45 degrees, and the third angle is 90 degrees. Two sides are equal.
A rectangle is a four sided polygon with four right angles and two pairs of parallel side. [Equal sides is not required since it is implied by parallel and right angles].
A parallelogram is a quadrilateral (four-sided polygon) with two pairs of parallel sides. By definition, a parallelogram does not need to have all right angles. Think of rhombuses, which do not have any right angles, yet are parallelograms. Therefore, the answer is no.