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☞Jawaban☜

7.A.

8.C

langkah² terlampir☝️

-_-PENYELESAIAN- _’-

7.a.288

=>((alasxtinggi alas):2)xtinggi prisma
=>((6×8):2)x12
=>(48:2)x12
=>24×12
=>288(a)

8.c.3.080

=>phixrxrxt
=>22/7x((14 : 2)x(14 : 2))x20
=>22/7x(7×7)x20
=>22/7x49x20
=>22/7×980
=>21.560/7
=>3.080(c)