Respuesta :

profereyes12122

Step-by-step explanation:

In each triangle the base and height are known

A1 = (4)(1)/2 = 4/2 = 2 cm2

A2 = (4)(3)/2 = 12/2 =6 cm2

A3 = (4)(9)/2 = 36/2 = 18 cm2

Hope this helps
The first one is 2

the second is 6

The third is 18

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