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x² = 5² - (8/2)²
x² = 25-16
x²=9
x=3
y² = (20/2)²+8²
y² = 100 + 64
y = √164 = 2√41
(z/2)² = 12²-(20/2)²
z²/4 = 144 - 100
z² = 4*44
z = 4√11