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# Students of a school staged a rally for cleanliness campaign. They walked through the lanes in two groups. One group walked through the lanes and ; while the other through and DA . Then they cleaned the area enclosed within their lanes. If and , which group cleaned more area and by how much? Find the total area cleaned by the students (neglecting the width of the lanes).

## Text solutionVerified

Solution : Since and , we have: Fig. Therefore, the first group has to clean the area of triangle , which is right angled. Area of base height The second group has to clean the area of triangle ACD, which is scalene having sides and . Here, Therefore, area of So first group cleaned which is , i.e., more than the area cleaned by the second group. Total area cleaned by all the students .
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 Question Text Students of a school staged a rally for cleanliness campaign. They walked through the lanes in two groups. One group walked through the lanes and ; while the other through and DA . Then they cleaned the area enclosed within their lanes. If and , which group cleaned more area and by how much? Find the total area cleaned by the students (neglecting the width of the lanes). Updated On Jun 27, 2023 Topic Heron's Formula Subject Mathematics Class Class 9 Answer Type Text solution:1 Video solution: 2 Upvotes 200 Avg. Video Duration 9 min
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