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6. Diket: Garis Singgung dalam (GS) = 16 cm
Tali Pusat (TP) = 20 cm
Jari-jari lingkaran 1 (R) = 5 cm
Dit: jari-jari lingkaran 2 (r)?
Jawab:
Ada rumus yg ane pake setiap ngerjain tipe soal begini :3
"TemPe GoSong Campur Rujak"
TP²=GS²+(R±r)² -> tanda (±) tergantung, pakai (-) kalo GS luar, kalo GS dalam pake (+)
20²=16²+(5+r)² -> karena GS dalam kita pake (+)
400=256+(5+r)²
(5+r)²=400-256
(5+r)²=144
5+r= √144
5+r=12
r=12-5
r = 7 cm
semoga bermanfaat^^