Do you know the right answer? Or just AN answer?

What is the nominal diameter of a number 6 rebar?
3/4 inch
2/3 inch
1 inch
1/3 inch
What is the cross sectional area of a number 9 rebar?
1 inch
1.5 inches
3/4 inch
2/3 inch
What is the vertical part of a stair called?
Riser
Step
Nosing
Tread
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