beserta caranya,terima kasih.

Mapel : Matematika

Kelas : 8

Bab : Garis singgung Lingkaran :

→ Gspd = 20 cm
→ d = 25 cm
→ R = 10 cm

Ditanya :
→ r =...?


Jawaban :

(R + r) ² = d² - Gspd²

(10 + r) ² = 25² - 20²

(10 + r) ² = 625 - 400

10 + r = √225

10 + r = 15

r = 15 - 10

r = 5 cm ✔