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R = 6 cm
r = 4 cm
D = 13 cm
maka :
P² = D² + (R+r)²
P² = 13² + (6+4)²
P² = 169 + 100
P = √269
P = 16,40 cm
13^2 = p^2 - (6+4)^2
13^2 = p^2 - 10^2
p^2 = 13^2 + 10^2
p^2 = 169 + 100
p^2 = 269
p = ✓269
p = 16,40 cm
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