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9.dik:R=3
r=2
s=12
rumus=s=√p²-(R+r)²
12=√p²-(3+2)²
12=√p²-(5)²
12²=p²-5²(akarnya dihilangkan kemudian 12nya diakarkan)
144=p²-25
p²=144-25
p²=119
p=√119=d
10.tidak terlihat