math

A ladder is 13.0m long. It leans against the wall. The base of the ladder is 3.7m from the wall. What is the angle of inclination of the ladder to the nearest tenth of a degree?

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asked by liya
  1. now wait a minute, time to learn this stuff:

    In a right triangle:

    sin theta = opposite / hypotenuse
    cos theta = adjacent / hypotenuse
    tan theta = opposite / adjacent

    so here we have
    hypotenuse is ladder, 13
    adjacent = along ground = 3.7
    so
    cos theta = 3.7/13

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    posted by Damon

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