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Posted by on Sunday, October 21, 2012 at 2:46am.

the floodlight is 6.1m tall. Jonny's height is unknown,though his shadow is 2m long when he stands 3m from the base of a floodlight.
What is the height of jonny?

  • maths - , Sunday, October 21, 2012 at 5:56am

    H = Height

    3 m + 2 m = 5 m


    Proportion :

    H / 2 = 6.1 / 5 Multiply both sides by 2

    H = 6.1 * 2 / 5 = 12.2 / 5 = 2.44 m

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