Respuesta :

greenforestaz

Step-by-step explanation:

step 1. The easiest way is to use Herons formula.

step 2. s = (a + b + c)/2 = (3 + 5 + 6)/2 = 7

step 3. A = sqrt(7(7-4)(7-5)(7-6))

step 4. A = sqrt(7(3)(2)(1))

step 5. A = sqrt(42)

step 6. A = 6.4807 = 6.5cm^2.

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