Plane Geometry Act

The ratio of the radii of two circles is 4:9. What is the ratio of their circumferences?

• 2:3

• 4:9

• 16:81

Triangles Δ ABC and Δ A'B'C' are graphed in the standard (x,y) coordinate plane below. Triangle Δ A'B'C' is the image of Δ ABC under one of the following transformations. Which one?

• Horizontal translation

• Reflection across the x-axis

• Reflection across the y-axis

• Line

• Square

• Pentagon

• Parallelogram

• Scalene Triangle

How many units is the diameter of a circle with equation \left(x-2\right)^2+\left(y-4\right)^2=64 ?

• 2

• 4

• 8

• 12

• 16