$$\(16 A\)$$ is inversely proportional to the square of $$\(r\)$$ $$\(A=5\)$$ when $$\(r=0.3\)$$ (a) Find a formula for $$\(A\)$$ in terms of $$\(r\)$$ (3) (b) Find the value of $$\(A\)$$ when $$\(r=7.5 A\)$$ $$\(A=\)$$ (3)

Answer:

Knowledge points:

Solution: