question What is the area of a circle with a radius of 9 units

Math

What is the area of a circle with a radius of 9 units?

A. 18�18π square units
B. 27�27π square units
C. 36�36π square units
D. 81�81π square units

Area of a circle = �×radius2π×radius2.

If �+2�=12a+2b=12 and 3�−�=63a−b=6, what are the values of �a and �b?

A. �=3,�=5a=3,b=5
B. �=4,�=4a=4,b=4
C. �=5,�=3a=5,b=3
D. �=6,�=2a=6,b=2

If 2�−5=112a−5=11, what is the value of �a?

A. 3
B. 4
C. 6
D. 8

What is the area of a square with a side length of 6 units?

A. 12 square units
B. 18 square units
C. 24 square units
D. 36 square units

If 3�−2=133t−2=13, what is the value of �t?

A. 3
B. 4
C. 5
D. 6

If 2332 of a number is 24, what is 3443 of that number?

A. 27
B. 36
C. 48
D. 64

If 3553 of a number is 36, what is 1551 of that number?

A. 12
B. 18
C. 24
D. 30

Solve for �x: 23�+5=1132x+5=11

A. �=6x=6
B. �=9x=9
C. �=12x=12
D. �=15x=15

If a circle has a diameter of 10 units, what is its radius?

A. 5 units
B. 7 units
C. 10 units
D. 20 units

If the base of a triangle is 6 units and its height is 8 units, what is its area?

A. 12 square units
B. 24 square units
C. 30 square units
D. 48 square units

If �+3=9x+3=9, what is the value of �x?

A. 4
B. 6
C. 7
D. 8