# How do you use Heron's formula to find the area of a triangle with sides of lengths #7 #, #4 #, and #9 #?

Here, we know that

which gives an area of

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To use Heron's formula to find the area of a triangle with sides of lengths 7, 4, and 9, first calculate the semi-perimeter, ( s ), using the formula:

[ s = \frac{a + b + c}{2} ]

Where ( a ), ( b ), and ( c ) are the lengths of the sides of the triangle. In this case, ( a = 7 ), ( b = 4 ), and ( c = 9 ).

Then, calculate the area using Heron's formula:

[ A = \sqrt{s(s - a)(s - b)(s - c)} ]

Substitute the values of ( s ), ( a ), ( b ), and ( c ) into the formula, and perform the calculations to find the area.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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