3
a cone doesn't contain any right angles fool !
One
16
No right triangle can have any obtuse angles inside it.
The 3 interior angles of any triangle always add up to 180 degrees
A two dimensional regular pentagon does not contain any right angles. A pentagonal prism, however, contains up to 10 right angles.
A triangle has 3 vertices and 3 interior angles that add up to 180 degrees
a triangle has 0 lines of symmetry.
Many shapes have a right angles. For example, a right angled triangle, square or rectangle all contain at least one right angle. Trapeziums may also contain right angles. Any irregular polygon may also contain a right angle.
None because it can only have 1 right angle and 2 acute angles to be a right angle triangle and the 3 angles add up to 180 degrees.
4 right angles, no other angles.