Answer:
6.9
Explanation:
8² = 4² + x²
64 = 16 + x²
48 = x²
x = 6.9
So you have an equilateral triangle, all sides are congruent.
The altitude bisects the base. You have two right triangles with sides x and 4 and a hypotenuse of 8.
64 - 16 = 48
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