Wouldn’t it be the 3rd answer 1/3 + 1/4 because you have to convert the dominators into 12 then you will get 4/12 and 3/12 then
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If it has 3 sides then it's a triangle.
Using the formula
where
and a=5 b=5 c=8
∴
Using the formula
where
and a=5 b=5 c=8
∴