Any rectangle that isn't a square.
rectangle
This is a special case of a quadrilateral called a rectangle.
a rectangle (that is NOT a square) has 4 right angles and consecutive sides of unequal lengths.
a circle
An acute triangle.
All triangles that are not right triangles.
right
Rectangle, octagon, hectagon, square...
Circle, cone, cylinder, sphere and equilateral triangle for example.
A geometric figure with three line segments as sides is called a triangle. Triangles can be classified based on their angles (acute, right, or obtuse) or their side lengths (scalene, isosceles, or equilateral). Each triangle has three vertices and the sum of its interior angles always equals 180 degrees.
A rhombus
rectangle