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50 POINTS STUCK

4. 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. 15.7 units
B. 31.4 units
C. 62.8 units
D. 78.5 units

Respuesta :

Answer:

C. 62.8 units

Step-by-step explanation:

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

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