book Maths Puzzle Numerical Ability

I have a right triangle I have to find the area for

On the figure they have points a b c
A to C 6ft C to B is 9ft and I must need A-B
the right triangle does show a 90 degree at point C

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book Other Question
if T =3ph +5 Find T when p =4 and h = 2 Expand terms
{{{y^2+(x+1)^2-2x^2=100}}} and
{{{x^2+(2y-1)^2=20}}}