AMO 2027 Grades 8-9 SET 18 - Self-study Question 1

Example 5. In the figure below, $ABCG$ and $CDEF$ are 2 squares, $BD=63$cm, $GF=9$cm. Find the area of the shaded part.

**Editorial input convention:** Enter the exact shaded area in square centimetres, as a number or equivalent fraction only.