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180 =4x + (8/5)
180 - (8/5)= 4x
x = 45 - (2/5)
(3x)² = (x)² + (8√5)²
9x² = x² + 64.5
9x² - x² = 320
8x² = 320
x² = 320/8
x² = 40
x = √40 cm