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Find area of quadrilateral triangle whose side is 9 CM |
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Answer» Answer: So you KNOW two things about this problem: the TRIANGLE is EQUILATERAL (meaning all 3 SIDES are equal in length), and one side is 9 cm long. So therefore, all sides of the triangle are 9 cm long. Using Heron’s formula - the area of a triangle is equal to the square root of S(S-A)(S-B)(S-C) and S=(A+B+C)/2 where A, B, and C are sides of the triangle - you get that the area is the square root of 1230.1875 - approximately 35.074028.
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