А, 2. (Power Functions)
Write down the formula of the function which gives the area A of a circle of radius r.
(b) Using fomulas for circles of radius rı and rz, and areas Ai and Az, to complete this:
A₂
(c) Using each of (a)'s function and (b)'s ratio and proportion result, how would we have to
adjust the circle's radius if we want its area to triple?
(d) The ratio A/A2 in (b) involving areas is "dimensionless". Why do we say this? ​

Statement reason 1. δabc is similar to δced. given 2. 3. definition of slope 4. slope of slope of definition of slope 5. slope of × slope of multiplying the slopes 6. slope of × slope of substitution property of equality 7. slope of × slope of simplifying the right side the table contains the proof of the relationship between the slopes of two perpendicular lines. what is the reason for statement 2? a. parallel line segments that meet a common perpendicular line are proportional in length. b. the lengths of vertical and horizontal sides in congruent triangles are in a common ratio. c. trigonometric identities determine the lengths of the legs in a right triangle. d. corresponding side lengths in similar triangles are proportional in length.