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r 2 = 3 cm
GSL = 15 cm
a. JPL ( jarak pusat lingkaran)
karena GSL, maka jari-jari nya dikurangi
R = r1 - r2
= 7 - 3
= 4 cm
JPL = √(15²+4²) = √241
b. garis singgung dalam (GSD)
karena GSD, jari -jarinya ditambah
R = r1 + r2
= 7 + 3
= 10
GSL = √(√241)² - 10²) = √141