Answer:
Radius
Step-by-step explanation:
The radius is a straight line from the center to the circumference of a circle
The diameter is a straight line, from circumference to circumference, that passes throught a citcle's center
The equation of a circle:

(h, k) - a coordinates of the center
r - a radius

Answer:
the center: (3, -2)
the radius: 3
The crab crawls 7ft below (-7) and the bird flies ft above (15) so the distance between 15 and -7 is 22
Answer:
12 cm
Step-by-step explanation:
This is a proportionality/similarity problem.
10 cm turned to 4 cm. So by how much has it decreased? In other words, <em>10 multiplied by </em><em>WHAT</em><em> is 4?</em>

0.4 is also known as the scale factor from the large diagram to the small diagram.
So how much would 30 cm become?<em> It would be 30 multiplied by the scale factor, which is </em><em>0.4</em><em>.</em>

<u>Hence, the length of the reduced diagram would be </u><u>12 cm</u><u>.</u>
Answer: 52.77876 in
Explanation: C=2πr=2·π·8.4≈52.77876 in