use the distance formula to find the length of the diameter.
Then, C = πd
The endpoints of the diameter of a circle are at (1,2) and (7,-6). What is the circumference of the circle to the nearest tenth of a unit?
a. 15.7units
b. 31.4 units
c. 62.8 units
d. 78.5 units
9 answers
Use distance formula or Pythagorean theorem.
Pythagorean-
6^2+8^2= radius^2
100= radius^2
10= radius
radius= r
Use circumference formula.
C=2pir
C=2pi10
C=62.83
C
Pythagorean-
6^2+8^2= radius^2
100= radius^2
10= radius
radius= r
Use circumference formula.
C=2pir
C=2pi10
C=62.83
C
What is the center of the circle that has a diameter whose endpoints are (6, -4) and (18, 10)?
C
B
C
B
C
D
B
C
A
C
B
C
B
C
D
B
C
A
C
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2 answers