The length of the unknown side is _. 6.7 7 10.8 1.73

c=10,8

Step-by-step explanation:

Using P.T. c^2 =a^2 +b^2

a=9, b=6

c^2 =9^2 +6^2

c^2 =81+36

c^2 =117

c=sqrt(117)

c=sqrt(9*13)

c=3*sqrt(13)

c=3*3,6

c=10,8

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

your answer is the frist one

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