A. 3.14159*(D/2)*(D/2) B. 3.14159*(D*D/4) C. 3.14159*(D/2)**2 D. 3.14159*D*D/4
A.64 B.12 C.256 D.16.
A.123,000 B.3.5E+2.5 C.TRUE D.“HELLO”