If this is an isosceles triangle, then the left side (12.5 ft) = the right side (0.25x ft). Set them equal to each other to solve:
12.5 = 0.25x (this would be the equation since both sides are equal to each other - definition of isosceles triangle that two sides are equal)
12.5/0.25 = 0.25/0.25x (divide both sides by 0.25 to solve for x)
50 = x
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