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The area of the rectangle is 60. We know from the labeled “5” and “8” lengths that the radius of the quarter circle is 13. That means that the diagonal length of the rectangle is also 13.
To calculate the area of a rectangle, you multiply the length by the width. 5cm × 8cm = 40cm² Remember, area is measured in square units, such as square centimetres (cm²) and square metres (m²).