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Keliling = 2 x (sisi a + sisi b)

[tex] = 2 \times (35 + 21 + 12) = [/tex]
[tex] = 103[/tex]

Luas = 1/2 x (a + c) x t

= 1/2× (15+30)+20


[tex] = 630[/tex]

semoga bermanfaat