Prisms and Cylinders

Part of the Surface Area & Volume section of Coddy's Geometry journey. Lesson 2 of 62.

Slice a loaf of bread anywhere and every slice has the same shape. A solid like that is a prism: two equal polygon ends joined by flat faces, with the same cross-section all the way through. A cuboid is a prism with rectangle ends. A triangular prism has triangle ends, like a tent or a chocolate bar box.

$A cylinder with radius 2 and height 7$

A cylinder works the same way with circles for its ends: a can, a pipe, a candle. Its two measures are the radius of the circle and the height between the ends. Here the radius is 2 and the height is 7.

In this course every prism and cylinder is a right one: its sides stand square to its ends. For a prism lying on its side, the distance from one end to the other is called its length. It is the edge that joins a corner of one end to the matching corner of the other.

Challenge

The prism lies on its side with triangle ends at the front and the back. Tap the edge that gives the prism's length, the distance from one triangle end to the other. Then press Check.

Try it yourself

$Find the right part on the figure$