This preview shows page 1. Sign up to view the full content.
Unformatted text preview: the size of
an angle is the easiest. Finding an edge provides two cases. With tans, for example, finding the 'opposite'
(the multiplication case) is easier than finding the 'adjacent' (the division case). Far too many just go for
multiplication, whether it appropriate or not.
Abstracting the necessary right-triangles from 3-dimensional situations provides difficulties for
most pupils. Encourage the use of primitive constructions, like holding some pens and pencils together
at the top to represent the edges of a pyramid. Have some 'wire' models available to view. Make up a
big model for demonstration purposes. Eight one-metre sticks and some lumps of plasticine enable a
pyramid to be assembled very quickly, and the various right-triangles can pointed out using more sticks
or some string. (Don't attempt cuboids, they are not rigid enough, and provide more amusement than
instruction!) A Diversion
Do you use the 'meaningless' string of letters
with its attendant mnemonic
Should Old Harry Catch Any Herrings Trawling Off America
View Full Document
This document was uploaded on 03/01/2014.
- Spring '14