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There is no rule for the perimeter of an acute triangle. You simply need to add the sides.
The answer depends on the information that you have: it could be the sine rule or the cosine rule.
Using the cosine rule: 13.0112367 cm The triangle is in fact an isosceles triangle.
If you know the lengths of the sides, you can use the cosine rule. If you have information about other aspects of the triangle, then other formulae will apply.
no it cannot represent as in angle triangle rule it doesnt prove that term