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Teorema Pythagoras
SMP Kelas VIII

c² = a² + b²
(x + 7)² = (x + 1)² + 12²
x² + 14x + 49 = x² + 2x + 1 + 144
x² + 14x + 49 = x² + 2x + 145
x² - x² + 14x - 2x + 49 - 145 = 0
12x - 96 = 0
12x = 96
x = 96 / 12
x = 8 cm

Sisi miring = x + 7
                  = 8 + 7
                  = 15 cm

HP = {15}  ===> [B]