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September 22, 2014

September 22, 2014

Posted by **sushmitha** on Saturday, December 3, 2011 at 9:35pm.

How tall is the streetlight?

- algebra -
**MathMate**, Sunday, December 4, 2011 at 12:54pmDraw a little sketch to convince yourself that the shadow of the light is 12'+ 5'=17'

Use proportions and cross product:

6.2 ft : 5 ft shadow

? ft : 17 ft shadow

height of light

= 6.2*17/5

= 21.08'

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