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(40√5)² = 120² - (5x + 3x)²
8000 = 14400 - (8x)²
8000 = 14400 - 64x²
64x² = 14400 - 8000
64x² = 6400
x² = 6400 / 64
x² = 100
x = √100
x = 10
R = 5x = 5(10) = 50 cm
r = 3x = 3(10) = 30 cm
G² = d² - (R - r)²
G² = 120² - (50 - 30)²
= 14400 - 400
= 10000
G = √10000
G = 100 cm
GSPL = 100 cm