luas 4 segitiga
= a x t : 2
= 18 x 15 : 2
= 135 cm²
luas persegi
= s x s
= 18 x 18
= 324 cm²
luas 4 persegi panjang
= p x l x 4
= 22 x 18 x 4
= 1.584 cm²
luas permukaan bangun
= luas 4 segitiga + luas persegi + luas 4 persegi panjang
= 135 + 324 + 1.584
= 2.043 cm²
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luas 4 segitiga
= a x t : 2
= 18 x 15 : 2
= 135 cm²
luas persegi
= s x s
= 18 x 18
= 324 cm²
luas 4 persegi panjang
= p x l x 4
= 22 x 18 x 4
= 1.584 cm²
luas permukaan bangun
= luas 4 segitiga + luas persegi + luas 4 persegi panjang
= 135 + 324 + 1.584
= 2.043 cm²