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A washer is made from a circular disc of radius 5.5 cm by removing a rectangular area of 18 cm2.
If a line is drawn from the centre of the washer through a corner of the rectangular area to the outer radius
of the washer, then the distance from the edge to the outer radius of the washer is 0.65cm.
Determine the dimensions of the rectangular area removed.
The center of the circle isCode:* * * * * * * * * *-------* * | x | * * | O*---+A * * | * |y * *-------* * B * * * * * * P * * *
The radius is
In right triangle , we have: . .
The area is 18: .
Substitute into : .
Quadratic Formula: .
The dimensions of the rectangle are: .