Yes
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28 millimetres, as stated in the question.
Using Pythagoras: hypotenuse2 = one_leg2 + other_leg2 ⇒ hypotenuse = √(one_leg2 + other_leg2) = √(212 + 282) = √1225 = 35 units.
21^2+28^2=c^2 441+784=c^2 1225=c^2 35=c
Using Pythagoras' theorem it is 35 inches
There are no first 5 multiple. Multiple is singular.