Question

Write an expression that represents the area of a circle with radius 3x^3. (For any circle with radius r, a=π r^2 = π .r .r ^.)

A. 9 π x ^9
B. 9π x6
C. 6π x9
D. 6π x^6

Answer 1

9514 1404 393

Answer:

B. 9πx^6

Explanation:

Putting the given radius into the area formula gives ...

A = πr^2

A = π(3x^3)^2 = π(3^2)(x^(3·2))

A = 9πx^6