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Matematika SMP Kelas VIII
Garis Singgung Persekutuan Dalam (GSPD)
Jarak antar pusat = √ [GSPD² - (R + r)²]
26 = √ [24² - (R + r)²]
(R + r)² = 26² - 24²
(R + r)² = 676 - 576
(R + r)² = 100
R + r = 10 ⇒ ambil hasil akar kuadrat yang positif
Jika R = 6 cm, maka r = 10 - 6 = 4 cm