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A= b × h / 2
b= base
h= altura
18 dm por 7 dm
A= (7×18)/2
A= 126/2= 63 dm²
10 dm por 3 dm
A= (3×10)/2
A= 30/2= 15 dm²
14 m × 8 m
A= (8×14)/2
A= 112/2= 56 m²
21 cm por 15 cm
A= (15×21)/2
A = 315/2= 157.5 cm²
12 cm por 12 cm
A= (12×12)/2
A= 144/2= 72 cm²
13 dm por 5 dm
A= (5×13)/2
A= 65/2= 32.5 dm²
A= base × altura / 2
1) A= (7×18)÷2 = 126÷2= 63 dm²
2) A= (3×10)÷2 = 30÷2= 15 dm²
3) A= (8×14)÷2 = 112÷2= 56 m²
4) A= (15×21)÷2 = 315÷2= 157.5 cm²
5) A= (12×12)÷2 = 144÷2= 72 cm²
6) A= (5×13)÷ 2 = 65÷2=32.5 dm ²