Concept explainers
Dimensions of a Rectangle A circular piece of sheet metal has a diameter of 20 in. The edges are to be cut off to form a rectangle of area 160 in2 (see the figure). What are the dimensions of the rectangle?
The dimensions of given rectangle.
Answer to Problem 44E
The dimensions of given rectangle is
Explanation of Solution
Given:
Diameter of circular piece of sheet metal is
Figure of circular piece of sheet metal and rectangle is,
Figure (1)
Calculation:
Let the length of rectangle is l, width of rectangle is w and diagonal of rectangle is d shows in Figure (2),
Figure (2)
Formula of area of rectangle is,
Diameter of circular piece is equal to the diagonal of rectangle because rectangle form inside the circular piece and the edges of rectangle touches the perimeter of circular piece so that the value of diagonal of rectangle is,
Diagonal of rectangle divides the rectangle in right triangle, use Pythagoras theorem to get the equation,
Solve the above equation to make complete square,
Substitute 20 for d and 160 for
Solve above equation for l,
Substitute
Further, solve above equation for w,
Substitute 17.88 for w to get the value of l,
Substitute 8.95 for w to get the value of l,
Thus, the dimensions of given rectangle is
Chapter 10 Solutions
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