Note that the two leg sides are both 20 measurements, suggesting that it is an isosceles triangle.
By definition of a isosceles triangle, the angles will be 45-45-90, and the sides will follow the 1-1-√2 rule, in which the 1 stands for the legs, and the √2 stands for the hypotenuse.
Add up all the different ages that they learned to walk then divide by the total so Let’s say 1 month + 11 months + 3 months + 6 months= 21 months divided by 4 = 5.25
