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= 20² + (10-5)²
= 20² + 5²
= 400 + 25
s² = 425
s = 5 √17 cm
r1 = 10 cm
r2 = 5 cm
g luar (garis singgung persekutuan luar) = 20 cm
Dit : j
Jawab :
g luar² = j² - (r1 - r2)²
(r1 - r2)² = j² - g luar²
(10 - 5)² = j² - 20²
5² = j² - 20²
j² = 20² + 5²
j² = 400 + 25
j² = 425
j = √425 = 20,6 cm