Difference of Square Areas

Two squares are given as depicted in the drawing. The side length of the larger square is 9,
the side length of the smaller square is 8. What is the difference between the area of the orange region and the area of the blue region?

Difficulty level (1 very easy - 10 very hard): 2

Arithmetic Geometry -> Area Calculation

Sources:

Young Mathematician Olympiad, 2019-2020, Stage A, Grades 3-4 Question 1

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