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= √400 + 225
= √625
= 25 cm
r = 7
GSPD = 20
P = ?
GSPD = akar kuadrat dari Pkuadrat - (R+r)kuadrat
20 = akar kuadrat dari Pkuadrat - (8+7)kuadrat
20 = akar kuadrat dari Pkuadrat - 225
400 = Pkuadrat - 225
400 + 225 = Pkuadrat
625 = Pkuadrat
25 = P
maaf ga punya simbol akar kuadrat dan kuadrat xD semoga membantuu