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Point B ii

In this movie we again move B along a line parallel to AC. We show the same two postions of B but now also highlight the resulting base and height each time. As can be seen, for B2 they have the values 2 and 6, so it easy to see that the area of the triangle is 6 unit squares.

For B1 we get a right-angled triangle but finding the lengths of the base and height is far less straightforward. We leave this as a task for the reader to solve, which we present on the final page: PS.