If km = no and km = pq, then no = pq.

which property is illustrated above?

a.
reflexive property
b.
symmetric property
c.
substitution property
d.
identity property

The property shown is a B: substitution property, this is when you you the know that X=Y so X can be substituted in any equation with Y and Y can be substituted in any equation with X. hope this helps 

The answer is "a"radius = 12.7 unitsdiameter = radius × 212.7 units × 2 = 25.4 units