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Mathematics 9 Online
OpenStudy (rayman5766):

Which choices name a chord of circle F? Choose all answers that are correct. A. AF B. BD C. CD D. DF http://static.k12.com/calms_media/media/1569500_1570000/1569850/1/eb804f813e01072ecb627a2cb7db228d0f7ff5e8/MS_IMB-1401203-1110102.jpg

OpenStudy (rayman5766):

I think it D

OpenStudy (owlcoffee):

A "chord" of a circumference is the segment that unifies two points that belong to the circle's perimeter.

OpenStudy (rayman5766):

so its all of them

OpenStudy (owlcoffee):

Incorrect. A Chord looks like this: |dw:1426525194148:dw|

OpenStudy (rayman5766):

oh so c and a

OpenStudy (owlcoffee):

"c" is correct, but "a" is not. You see AF is not a "chord" because it joins the center with a point of the circle, that's called a "radius"

OpenStudy (rayman5766):

oh I get it now so its c and d

OpenStudy (owlcoffee):

Nope, DF is a "radius" as well.

OpenStudy (rayman5766):

well how is it b because it goes in a strait line

OpenStudy (owlcoffee):

BD is a chord, but it's a special kind of chord, known as "diameter" because it contains the center of the circle, but it represents a chord.

OpenStudy (rayman5766):

oh ok

OpenStudy (rayman5766):

can you help me with a nother one with radius

OpenStudy (owlcoffee):

sure.

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