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= 1/2 × 4 × 5
= 1/2 × 20
= 10
L2 = p × l
= 2,5 × 4
= 10
L3 = p × l
= 12 × 4
= 48
L4 = 1/2 × a × t
= 1/2 × 5 × 3
= 1/2 × 15
= 7,5
Luas seluruhnya = 10+10+48+7,5=75,5 cm kuadrat
Keliling =7,5+7+1,5+12+5+3+12+4= 52 cm
maaf kalo ada yg salah yah :v