Well to put it simply if 'b' was taken out of the equation it simply wouldn't work.
here is a ritten example: a^2+b^2=c^2
a=2 b=3
now 2^2=4 and 3^2=9 so c^2= 13
now if we remove 'b': a^2=c^2
if a=2 as in our last example then this equation would be telling us: 2=13 and we all know 13 does not equal 2
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to find the missing side of a right triangle you need the pythagorean theorem. A2 + B2 = C2. c is the longest side and a and b is the other sides. no particular side is a or b just the longest side is c.
14cm and 11cm what is the missing side using pythagorean theorem
it is used on right triangles which is a triangle with a 90 degree angle. a^2+b^2=c^2 the c^2 is always the longest side.
If there is no length for the hypotenuse you have to use the Pythagorean Theorem. If there are two sides missing and a reference angle you could use Trigonometry.
(a^2)+(b^2)=(c^2)