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Kelas 8 MatematikaBab Garis Singgung Lingkaran
R + r = √(jarak pusat² - garis singgung²)
10 + r = √(17² - 8²)
r = -10 + √(289 - 64)
r = -10 + √225
r = -10 + 15
r = 5 cm
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