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The result you get is an algebraic real number:

sage: V = P.volume(measure = 'induced'); V
1.414213562373095?
sage: type(V)
<class 'sage.rings.qqbar.AlgebraicReal'>
sage: V.parent()
Algebraic Real Field

The result is exact, it is just the string representation that contains an approximation with a question mark at the end. (The question mark distinguishes it from an ordinary floating point approximation.)

The number is the root of a polynomial:

sage: V.minpoly()
x^2 - 2

In some cases (like here) you can express the number using radicals:

sage: V.radical_expression()
sqrt(2)