A square is a plane geometric figure having 4 equal sides and 4 right angles.
Yes. It is a quadrilateral with right angles and opposite sides equal.
An acute triangle.
a circle
A rhombus is a geometric figure having four sides of equal length. If all the angles inside the rhombus are right angles (90o), then the rhombus is a square.
Well, honey, a rhombus is a special type of quadrilateral with all sides equal, while an isosceles trapezoid has at least one pair of parallel sides. So, technically speaking, a rhombus can be considered an isosceles trapezoid if you squint your eyes and tilt your head a bit, but let's not get too carried away with geometry gymnastics now.
All triangles that are not right triangles.
An obtuse triangle can have no right angles, and has two equal angles.
right
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
Rectangle, octagon, hectagon, square...
Circle, cone, cylinder, sphere and equilateral triangle for example.