Question 9
The figure below is made up of a quadrant ABG, a rectangle BCEG and an isosceles triangle CDE. Find the total area of the shaded part.
**Editorial note for this self-study exercise:** Use the geometry marked in the figure: A, B, C, D are collinear in that order; G, F, E are collinear; the quadrant has centre B; CE=CD=21 cm; AD=64 cm. Give the exact shaded area as aπ+b square centimetres. Enter a;b using reduced fractions and no spaces, for example 3/2;5/4. Do not replace π by a decimal or 22/7.
**Editorial note for this self-study exercise:** Use the geometry marked in the figure: A, B, C, D are collinear in that order; G, F, E are collinear; the quadrant has centre B; CE=CD=21 cm; AD=64 cm. Give the exact shaded area as aπ+b square centimetres. Enter a;b using reduced fractions and no spaces, for example 3/2;5/4. Do not replace π by a decimal or 22/7.