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Garis Singgung Lingkaran
Diketahui:
R = 7 cm
r = 5 cm
a = 15 cm
Ditanya:
dd
Dijawab:
dd = √(a² - (R+r)²)
dd² = a² - (R+r)²
dd² = 15² - (7+5)²
dd² = 225 - 12²
dd² = 225 - 144
dd² = 81
dd = √81
dd = 9
Disimpulkan:
Panjang garis singgung persekutuan dalamnya adalah 9 cm.