Answer:
pythagoras theorem formula
h^2=p^2+b^2
here hypotenuse is 13
you can take a as either perpendicular or base
lets take it base
(13)^2=(12)^2+(a)^2
169=144+a^2
169-144=a^2
25=a^2
=a
5=a
Explanation:
a = 5
Using Pythagoras' theorem in the right triangle
a² + 12² = 13²
a² + 144 = 169 ( subtract 144 from both sides )
a² = 25 ( take the square root of both sides )
a = = 5
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