Question

Questions in ze comments.

Answer 1

do you know the definition of "chord" ?

Answer 2

I've the definition, but for whatever reason.. I cannot grasp the meaning.
"A straight line segment whose endpoints both lie on the circle."

Answer 3

pick two spots on the circle

connect the dots (draw a line between them)

http://www.mathsisfun.com/definitions/chord.html

Answer 4

That simple? I'm really disappointed in myself.

Answer 5

in the first question, there are a lot of chords. I would count how many, and choose the answer with that many chords listed.

Answer 6

For the 2nd two questions, the central angle of a sector can range from 0 (no sector)
to 360 degrees (the whole circle)

example: sector is ½ of the circle. then the angle is ½ * 360 = 180 degrees
example 2: sector is ¼ of the circle. Its central angle is ¼ * 360 = 90 deg

Answer 7

So far...
B
True?

Answer 8

yes. you multiply 0.67 * 360

Answer 9

for the last question, you do the same thing , but use the angle for the "pie" sector

Answer 10

129.6.
Therefore D.

B
True
D?

Answer 11

Damn. Rather than B, 'twas C.

Oh well.

My sincerest gratitude.