Question

Students of a school staged a rally for cleanliness campaign. They walked through the lanes in two groups. One group walked through the lanes AB, BC and CA; while the other through AC, CD and DA (see figure). Then they cleaned the area enclosed within their lanes. If AB = 9 m, BC = 40 m, CD = 15 m, DA = 28 m and ∠B = 90º. Find the total area cleaned by the students (neglecting the width of the lanes).

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

so this is the answer from class 9 heron's formula chapter NCERT