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19.
Vprisma = L alas x t
sedangkan
L alas =
V prisma = satuan volum
20. dan 21 lupa caranya
22 . tan 75 - tan15
= 2sin90 / ( cos90 - cos 30 )
= 2.1 / (0 - 1/2)
= 1/2
23 dan 24 lupa caranya
cek lg yg no 24 yaa!!