Question
In Exercises $21-28,$ decide whether a triangle can be formed with the given side lengths. If so, use Heron's Formula to find the area of the triangle.$$a=5, \quad b=9, \quad c=7$$
Step 1
According to the triangle inequality theorem, the sum of the lengths of any two sides of a triangle must be greater than the length of the third side. So, we add the two smallest sides: \[5 + 7 = 12\] Since 12 is greater than 9, a triangle can be formed with these Show more…
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