Cylinder: Wedding cake

A cylinder has 2 circular faces. This wedding cake is made of three cylinders. Cans are probably the most common cylinder, but other things can be cylinders, like this deli meat.

Octagon: Pokemon box

The top of this Pokemon box is an octagon. An octagon has 8 sides and 8 vertices.

Right Angle: Popcorn boxes.

These popcorn boxes have 8 vertices and they are all right angles. A right angle is always exactly 90 degrees.

Popcorn does not have any right angles.

Acute Angle: Pointy circle sign

These pointy circle signs have multiple acute angles all around them. An acute angle is less than 90 degrees.

Obtuse Angle: Sock box

Obtuse angles are greater than 90 degree angles. ("Obtuse" sounds like "obese," which means "fat," so you can also say "fat angle.") The top-right angle of this sock box is obtuse.

Triangular Pyramid

The legs of this table form 2 triangular pyramids. (One is upside down.) A triangular pyramid is made of 4 triangular faces and 4 vertices. The angles and vertices don't have to be identical, but these are.

Triangular Prism: Cheesecake boxes

These cheesecake boxes are triangular prisms. They have two triangular faces and three rectangular faces. They have 6 vertices.