1.

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 Fig. 12.12). Then they cleaned the area enclos

Answer» areaABC=1/2*BC*AB
1/2*40*9=180`m^2`
By Pythagoras Theorem
`AC^2=AB^2+BC^2`
`AC^2=9^2+40^2`
`AC^2=1681`
`AC=41m`
s=(a+b+c)/2=84/2=42
Herons formula
areaACD=`sqrt(s(s-a)(s-b)(s-c))`
`=sqrt(42(42-15)(42-41)(42-28))`
=126`m^2`
Group 1 has cleared more area of 54`m^2`.


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