No. Use the vertical line test along the Y axis and if the line is crossed more than once, you know that it isn't a function.
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they all have more than one sidethey have more than one sidessquarehexagonheptagonoctagonnonagondecagon
it has only one base and not more than the prism has more than one
There could be more than one radius because of how many half of a diameter you find.
wrong!
No, a triangle can not have more than one right angle.