book Maths Puzzle Numerical Ability

An isosceles triangle has an area of 200 square units, and the altitude to the base measures 10 units. What is the perimeter of the triangle?

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book Other Question

What are complementary and supplementary angles? The text book is by McDougal Littell. Middle school math. The width of a rectangular window is 10 feet less than twice its length. If the perimeter is 28 feet, find the dimensions of the window. be sure to show all of the following.
a) l