L = 1/2 . (a+c) . t

dan,

K = a + b + c + d

Ket :

a = alas

c = sisi yang sejajar dengan alas

Contoh soal

Tentukan luas dan kelilingnya !

Jawab :

Luas (L) = 1/2 . (9+4) . 12

L = 1/2 . (13) . 12

L = 78 cm2

Keliling (K) = a + b + c + d

K = 9 + 15 + 4 + 15

K = 43 cm

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