pake cara ya kak .ya.....

1. p= 35cm
l = 20cm
t = 10cm

luas balok = 2(pl+pt+lt)
2( (35×20)+(35×10)+(20×10) )
2( 700+350+200)
2× 1250 = 2.500cm²

v balok = plt
35×20×10 = 7.000cm³

2. r = 49cm
D = 49×2= 98cm

luas lingkaran= πr²
22/7×49×49 = 7546cm²

kll lingkaran = πD
22/7×98 = 308cm