William Dorsey

Mathematics

11 May, 05:58

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.