find the area of an equilateral triangle with side 4 root 5 cm
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area of triangle= root3/4 x side square
=root 3/4 x 80
=root3 x 20
=20 root 3
20 x 1.732
==34.64
=root 3/4 x 80
=root3 x 20
=20 root 3
20 x 1.732
==34.64
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