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= 400 + 225
= 625
Garis singgung = 25 cm
19. l² = p² - (R-r)²
= 17² - (12-4)²
= 289 - 64
= 225
l = 15 cm
20. d² = p² - (R+r)²
15² = 17² - (R+2)²
225 = 289 - (R+2)²
-64 = - (R+2)²
- 8² = - (R+2)²
8 = R+2
6 cm = R
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