If you extend the top and bottom of a right angled trapezoid by 5cm, the area will increase by 25cm, and then it will become a square. Find the area of the original right angled trapezoid

The height of right angled trapezoid is: 25 × 2 △ 5 = 10 (CM), the area of right angled trapezoid is: 10 × 10-25, = 100-25, = 75 (square cm). Answer: the original area of right angled trapezoid is 75 square cm

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