no 34&35 pake cara kak

34.v = 1/3.La.t
= 1/3 . 25.15.7
= 2625/3
=875 cm ^3
V = La .t
450 = 5.12/2 .t
450 = 60/2 .t
450 = 30.t
t =450/30
t =15
p.s = La : luas alas
semoga bermanfaat