Question

Students of a school staged a rally for cleanliness campaign. They walked through the lanes in
iwo groups. One group walked through the lanes AB, BC, CA, while the other through AC, CD
and DA. Then they cleaned the area enclosed within their lanes. If AB 9 m, BC 40 m,
CD 15 m, DA = 28 m and angle B 90%, which group cleaned more area and by how much? Find
the total area cleaned by the students.
(NCERT)​

Answer 1

Answer:
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Answer 2

Step-by-step explanation:

1/2×9×40

=20×9:180

perimeter; A+B+C/2

41+15+28/2

:84/2....42

then..

✓s×s-a × s-b × s-c

s... 42...(42× 42-41 ×42-15×42-28)

42×1×27×14

✓14×3×3; 126

then...126+180; 306m2