7. A piece of land is in the shape of rhombus, whose diagonals are 20 m and 21 m long. Find the area of the land. Also find the length of a wired fencing around the boundary of the land
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area of rhombus =1/2×d1×d2.so by using this formula we can find the area as 210sq.m and we know that diagonals of rhombus bisect at 90 degree so take any one triangle formed by these diagonals and than by pythagorus theorm we can find one side of rhombus and than perimeter of rhombus as 4×side we can find the length of wire
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