tolong jawab no 29 30 dan 31 beserta cara ok thx

NO.29.
=3,14 x 15 x 15 x 40
=3,14 x 9000
=314 x 90
=28.260 (c)

NO.30.
=Bangun 1
=s³ =16³
=4.096
Bangun 2
= axt/2xT =10x16/2x16
=80x16 = 1.280

4.096 + 1.280 = 5.376 (B)

NO.31.
V = pxlxt
=10x6x1,5x2/3
=6x15x2/3
= 60 m³ (A)