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Mathematics 8 Online
OpenStudy (anonymous):

All of the triangles in the figure below are congruent. What is the area of the figure? Note that all measurements are in centimeters. Note that the apothem shown is equal to 3 square root of three.

hero (hero):

The sides equal 4 and the base equals 6. Also, you can split the hexagon in the center into triangles as well:

OpenStudy (anonymous):

okay...

hero (hero):

Now all you have to do is use Heron's formula to find the area of one of the triangles, then multiply that by the total number of triangles, 12.

OpenStudy (anonymous):

what in the world is Heron's Formula?

hero (hero):

\(A = \large\sqrt{s(s-a)(s-b)(s-c)}\) \(\huge s = \frac{a + b + c}{2}\) a, b, c are sides of the triangle

hero (hero):

A = area of the triangle

hero (hero):

In this case, a = 4, b = 4, c = 6

OpenStudy (anonymous):

the only thing even close to that I learned is A=1/2bh

hero (hero):

What I showed you is an alternate formula for use when you know the lengths of the sides

OpenStudy (anonymous):

so what do I do?

hero (hero):

Solve it using the information I gave you.

hero (hero):

You have the values of a, b, and c. Now, calculate s and use the new formula for Area.

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