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Posts tagged with altitude

Triangles in Everyday Life


We find triangles all around us – whether in construction, surveying, flight paths, bridge design or in fabric shapes and tiles. This picture shows a clever use of equilateral triangles on a building in Brisbane city. You can find 38 jobs that use congruent triangles here! Find out more about the properties of triangles with […]

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Tour with Altitude


As Bradley Wiggins rides (on a bike with better wheels than the one above) to a British win in the Tour de France, here are some questions to do with the hill stages of this incredible race: Category 3 climbs last approximately 5 kilometres have an average grade of 5 percent. How many metres will […]

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Post Support

The graph on the left (Coronavirus) is for a time period of 30 days, while the one on the right (SARS) is for 8 months! Very poor graphical comparison and hardly relevant, unless it is attempting to downplay the seriousness of the coronavirus?

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

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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