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a.a=24.2/6
48/6
8
b.a=21.2/7
a=42/7
a=6
c.a=30.2/12
a=60/12
a=5
d.a=144.2/16
a=288/16
a=18
Tinggi : 12
Rumus ----
L = 1/2 alas x tinggi
30 = 1/2 x alas x 12
30 = 6 x alas --( dpt 6 dr 12 : 2) atay stnghnya 12
30/ 6 = alas
5 cm = alas