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L = 1/2 x (a+b) x t
= 1/2 x (20+30) x 15
= 1/2 x 50 x 15
= 1/2 x 750
= 375 cm2
Segitiga Siku Siku
L = 1/2 x a x t
= 1/2 x 20 x 18
= 1/2 x 360
= 180 cm2
L keseluruhan = 375 cm2 + 180 cm2
= 555 cm2