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Platonic Shapes and Nets

August12

Platonic Solids are five regular polyhedra (“regular” because they are made up of faces that are all the same), and are called “Platonic” since they were known at the time of Plato (427-347 BC).  This link to these shapes also has printable nets for constructing them… a great, practical way to get hooked into some […]

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NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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