book Maths Puzzle Numerical Ability

What is the perimeter of a rhombus-shaped highway sign with a 20-centimeter side?
a) 40cm
b)80cm
c)400cm
d)20cm

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book Other Question

how do i write a verbal expression for each algebriac expression........ 15r, 5 power 4, and 2n power 2 + 12 The angle of elevation from the top of a tree to a point 30 feet from its base is 25 degrees. Find the height of the tree.