Titik pusat= 17 cm,garis singgung luar= 15 cm,r= 2cm,ditanya R

(R-r)²=p²-l²
(2-r)=17²-15²
(2-r)=289-225
2-r=
[tex] \sqrt{64} [/tex]
2-r=8
r=2-8
=6.

maaf yah kalo salah.
semoga membantu.

Mapel Matematika
Bab PGSPL

PGSPL^2 = J^2 - (R - r)^2
(R - r)^2 = J^2 - PGSPL^2
(R - 2)^2 = 17^2 - 15^2
(R - 2)^2 = 289 - 225
(R - 2)^2 = 64
(R - 2) = 8
R = 10