Tolong bantu jawab yaa..

1).LP=2πr(r+t)
=2π5(5+12)
=2π(25+60)
=2π(85)
=170π
2).V.bola=4/3πr^3
=4/3×22/7×7×7×7
=88×49÷3
=1437,33cm^3