Idea 12of 22Builds onDifferent buildings can share a view
Each view rules out more buildings
How many views do you need to build exactly what was drawn?
Today you'll discover
- how many buildings fit one view
- what each extra view does
- which view to ask for next
Think firstOnly the front view: 3, 1, 1
With just this front view, can you build the exact building that was drawn?
Decide first, then press Next. Watch the number of buildings that fit as each view is added.
Down the left, a front view of columns 3, 1, 1, with the side and top views still question marks. A line counts 63 buildings that fit. The side view, 2 then 3, is added: 9 fit. The top view, an L of 4 squares, is added: only 1 fits.
See the whole ideathe big idea and the key word, in one place
The big idea
Each extra view rules out buildings; with enough information, only one building fits.
Buildings that fit
Front view only: 63 fit. Add the side view: 9. Add the top view: 1. Each view rules some out.
- Front63
- + Side9
- + Top1
Easy to get wrongThe back view never helps: it is the front view flipped. Ask for a side or top view instead.
Key word
- enough information
- enough views, or numbers, that only one object fits them
Ready to use it?
- Say whether some views are enough to build from.
- Choose the view that would help most.