hitunglah garis singgung gambar disamping ?

Kelas 8 Matematika
Bab 7 - Garis Singgung Lingkaran

Dik:
R = 14 cm
r = 4 cm
S = 30 cm

Dit:
GSD = ... cm?

Penyelesaian:

[tex]GSD = \sqrt{S^{2} - (R + r)^{2}} \\ GSD = \sqrt{30^{2} - (14 + 4)^{2}} \\ GSD = \sqrt{900 - 18^{2}} \\ GSD = \sqrt{900 - 324} \\ GSD = \sqrt{576} \\ GSD = 24 \: cm[/tex]

Semoga Membantu^-^