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# Constant in a Program

Free
APCSP-LQDKQT

Consider the following short program:

1.  pi  ← 3.14159
2.  r ← INPUT()
3.  a ← pi * r * r
4.  DISPLAY (a)


In the short program above, which is best thought of as a constant?

A
pi

B
r

C
a

D
pi * r * r