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Excellent homework answers on page 53 of the first volume of the fifth grade of Huanggang Small Champion in Mathematics
Shadow area = sum of areas of two squares-area of isosceles triangle with side length of 10-area of right triangle with side length of 18 and 8 respectively is calculated as follows: sum of areas of two squares = 10 */kloc-0+8 * 8 =/kloc-0.