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P = 29 cm
D = 20 cm
R = 12 cm
mka :
(R+r)² = P² - D²
(12+r)² = 29² - 20²
(12+r)² = 841 - 400
12 + r = √441
r = 21 - 12
r = 9 cm
jadi pnjng r yang lain adlh 9 cm
(144+r2)2=841-400
(144+r2)2=441
r2=21
21-12=9