tolong jawab dengan caranya

15*=17*-(5-x)
225=289-(5-x)
(5-x) =289-225
(5-x) =√64
(5-x) =8
-x=8-5
x=3

Mapel : Matematika

Kelas : 8

Bab : Garis Singgung Lingkaran
==========================

Diketahui :

→ R = 5 cm

→ Gspd = 15 cm

→ d = 17 cm


Ditanya → jari jari lain

Jawaban :
==========


(R + r) ² = d² - Gspd²

(5 + r) ² = 17² - 15²

(5 + r) ² = 289 - 225

(5 + r) ² = 64

(5 + r) = √64

5 + r = 8

r = 8 - 5

r = 3 cm ✔