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dik :
p^ = 25
R = 10
r = 8
dit : d^
rumus :
d^ = p^ - (R + r)^
jawab :
d^ = 25^ - (10+8)^
d^ = 25^ - 18^
d^ = 625 - 324
d^ = 301
21.
dik :
d^ = 12^
R = 10
r = 6
rumus :
p^ = d^ + ( R + r )^
p^ = 12^ + (10+6)^
p^ = 12^ + 16^
p^ = 144 + 256
p^ = 400
p = √400
= 20