A cone has radius 3 and height 4. Your classmate calculates its surface area as shown:
S. A.=π (5) 2+π (3) 2=25π+9π=3π. Explain your classmate's error.
A. The lateral area should have been calculated as π (3) (4).
B. The lateral area should have been calculated as π (3) (5).
C. The lateral area should have been calculated as π (4) (5).
D. The base area should have been calculated as π (1.5) 2.
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