It depends on your/their parents' genes. So, it varies in size.
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1.414 ie root 2
Area = 1/2*9*12 = 54 square cm
It is obvious from the coordinates that, if A = (-1, -1), B = (3, -1) and C = (-1, 2) thenAB is horizontal and of length 4 AC is vertical and of length 3 So ABC is right angled with legs of length 3 and 4 and so with an area of 6 square units.
A baby walks (crawls) with 4 legs + arms, a man walks with 2 legs, and an old man walks with 2 legs and 1 can (3).
1 year and three months