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20 April, 15:18

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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Answers (1)
  1. 20 April, 16:54
    0
    2pi*rh+2pi r^2
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