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Solution 4.1:3b

From Förberedande kurs i matematik 1

Revision as of 09:32, 27 September 2008 by Ian (Talk | contribs)
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Because one of the angles in the triangle is 90, we have a right-angled triangle and can use Pythagoras' theorem to set up a relation between the triangle's sides.

The side of length 13 is the hypotenuse in the triangle, and Pythagoras' theorem therefore gives us that


132=122+x2


i.e.


x2=132−122


This means that


x=132−122=169−144=25=5 

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