21. The perimeter of an ellipse can be approximated by: P=z(a+b)/3- (3a+b)(a+36) a+b Calculate the perimeter of

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21. The perimeter of an ellipse can be approximated by: P=z(a+b)/3- (3a+b)(a+36) a+b Calculate the perimeter of an ellipse with a 18 in. and b=7in.

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