The diameter of the circle is the diagonal of the rectangle use Pythagoras this rectangle is a made from two 3,4,5 triangles, so the diameter is 5cm, the radius will be 2.5cm don't forget the BODMAS ordering rule (Brackets of Division Multiplication Addition and Subtraction) Also rounding to 2 decimal places. This solution is based on all four corners of the rectangle touching the circumference of the circle.
Area of a circle is P (22/7) i x Radius (squared ^2) ====> 22/7 x 2.5cm ^ 2 ====> 22/7 x 6.25cm
TOTAL AREA of CIRCLE = 19.64 cm^2
Area of the rectangle is length x width ====> 4 cm x 3 cm
TOTAL AREA of RECTANGLE = 12 cm ^2
The remaining portion is the circle area minus the rectangle 19.64-12 = 7.64 cm^2
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