The length of two of the sides of an isosceles is 5 and 16 what is tje perimeter

The perimeter should be equals to 37 since 16 + 16 + 5 = 37
The other side cannot be equals to 5 since the sum of two sides is not greater than the remaining side, no triangle can be made ( 5 + 5 is not greater than 16)
So the remaining possibility is 16 + 16 + 5 = 37
I hope you understand and this helps.
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Cd is the perpendicular bisector of both xy and st, and cy=20.find xy

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