P= 1/2 * e * f
P= 1/2 * 4 * 12
P= 24 cm²
P= (a+b)*h * 1/2
P= (12+8)*0,9 * 1/2
P= 18 * 1/2
P= 9 dm²
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P= 1/2 * e * f
P= 1/2 * 4 * 12
P= 24 cm²
P= (a+b)*h * 1/2
P= (12+8)*0,9 * 1/2
P= 18 * 1/2
P= 9 dm²