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= 2 x 1/2 x a x t
= 2 x 1/2 x 30 x 10
= 2 x 150
= 300
L II
= 2 x 1/2 x a x tt
= 2 x 1/2 x 12 x 17
= 2 x 102
= 204
L III
= p x l
= 30 x 12
= 360
Luas permukaan = 300 + 204 + 360
= 864 cm persegi