Stage 9 - Q10 - 5 marks
19586
Challenge: Two squares have sides \(\frac{7}{2}\) cm and \(\frac{2}{3}\) cm. A third square has side equal to the sum. Find how much greater the third area is than the first two combined, then explain a rule that works for any positive a and b.
Hint
A square built from the two side lengths contains two cross rectangles.