Answer:
idk 3 maybeeed im in 3rd grade idk
You would measure the length of a segment with a straightedge because it is free from curves and can help measure a segment because it is straight.
The equation of circle in standard form is 
<h3><u>Solution:</u></h3>
Given that circle having center point (3,7) and the radius r = 4
To find: equation of circle in standard form
<em><u>The equation of circle is given as:</u></em>

Where center (h,k) and radius r units
Given that center point (h , k) = (3, 7) and radius r = 4 units
Substituting the values in above equation of circle,

Thus the equation of circle in standard form is 
Answer:
50.24 units^2
Step-by-step explanation:
Area of circle formula:
r^2
r = 4,
= 3.14
3.14 * (4^2) = 3.14 * 16 = 50.24