Assuming that the given triangle is a right triangle where height and base are equal, we can solve for the missing variables. Let us review the given problem, the given is the total area since unit of "a" is inch squared.
The formula for an area of a triangle is At = 1/2(bxh). We substitute the given value and assume that h=b.
Therefore, 48=1/2bh. To eliminate 1/2, we multiply both sides by 2. Then we have 96=bh. When b=h, we have b^2=96.
The missing variables are b=h=9.8.