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Idea 20of 22Builds onViews of an everyday object: a mug

A line in a view shows where the height changes

What does a line inside a view tell you?

Today you'll discover

  • what the line on a house's top view is
  • how each view shows a roof's peak
  • what crossing lines on a pyramid mean

Think firstThe top view of a house

Why is there a line down the middle of this top view?

Decide first, then press Next. Find the thick lines, and where they are on the house.

The top view of a house: a rectangle with a line down the middle. Then the house from a corner, its roof peak drawn thick, running from front to back. Then all three views with the edge lines thick: the side view's line where the roof starts, the top view's peak. Then the front view, a square with a triangle on top.

See the whole ideathe big idea and the key word, in one place

The big idea

A line inside a view marks an edge where the height changes, like a roof's peak.

Where it goes nextArchitects' roof drawings use lines the same way: each line is where two slopes of the roof meet.

For exampleA cup's top view has two circles: the rim, and the bottom further down inside.

Key word

edge line
a line drawn inside a view where two surfaces meet and the height changes

Ready to use it?

  • Explain the lines in a top view.
  • Draw edge lines in a view.
Practise this idea