Find the area of the triangle, given that it has a perimeter of 15 inches. Round the answer to the nearest tenth. https://media.edgenuity.com/evresources/2091128_cdd0342c-8ba2-4b6b-9a70-a3a8a3c2be63.png A. 10.8 square inches B. 12.5 square inches C. 21.7 square inches D. 97.4 square inches using herons formula to solve

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Find the area of the triangle, given that it has a perimeter of 15 inches. Round the answer to the nearest tenth. https://media.edgenuity.com/evresources/2091128_cdd0342c-8ba2-4b6b-9a70-a3a8a3c2be63.png A. 10.8 square inches B. 12.5 square inches C. 21.7 square inches D. 97.4 square inches using herons formula to solve

Trigonometry
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its an equilateral triangle so a sides are 5 including the height so it B
sorry i misread the question here is the diagram again
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Other answers:

equilateral triangle so each side has length 15/3 = 5 the perpendicular line h cuts the base of the triangle in half find h using pythagoras theorem Area = h * 2.5
5x2.5 = 12.5 so its 12.5 B
its 2.5 * height of the triangle (h)
\[\frac{5}{2} 5 \sin (60 {}^{\circ})=\frac{25 \sqrt{3}}{4}=10.8253 \]
what is it looking for
- or you could use trigonometry as robtobey has done

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