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Mathematics 16 Online
zarkam21 (zarkam21):

Helpp

zarkam21 (zarkam21):

OpenStudy (agent0smith):

You should have that website in your favourites by now lol, cos you need it here too

OpenStudy (danielannx3):

D

zarkam21 (zarkam21):

360-52 right

OpenStudy (agent0smith):

http://www.regentsprep.org/regents/math/geometry/gp15/circleangles.htm Number 2. Post this link with every question you post. So i don't have to keep searching for it.

zarkam21 (zarkam21):

26

OpenStudy (agent0smith):

No, the angle which you're given, is half of the arc you need to find

OpenStudy (danielannx3):

128-52=76

zarkam21 (zarkam21):

104

OpenStudy (phi):

There are a few ways to figure out this problem. One way: can you find the length of arc YZ ?

zarkam21 (zarkam21):

52*2?

OpenStudy (phi):

yes

zarkam21 (zarkam21):

104

OpenStudy (phi):

so 104 for arc YZ next, the line XZ is a diameter. Half of a circle has arc length 180 degrees (from X to Z) by Y to Z is 104 what does that make X to Y ? XY + YZ = 180 XY + 104 = 180

zarkam21 (zarkam21):

so would it be 180-104

OpenStudy (phi):

yes

zarkam21 (zarkam21):

76

OpenStudy (phi):

yes. Another way to do this, is to see that the triangle OXY is isosceles (two sides are the radius) so the base angles are equal |dw:1466434232369:dw|

OpenStudy (phi):

A third way. a triangle where one side is the diameter is a right triangle. (one of those interesting facts) |dw:1466434386474:dw|

zarkam21 (zarkam21):

Another question?

zarkam21 (zarkam21):

for radius it would be units squared

OpenStudy (phi):

is a radius a line or a shape ?

zarkam21 (zarkam21):

This is the question ....to the nearest hundredth what is the radius of a circle with a circumference of 6

zarkam21 (zarkam21):

I know the answer is 0.95

OpenStudy (phi):

ok. now is a radius a line or a shape ?

zarkam21 (zarkam21):

shape

OpenStudy (phi):

shapes have length and width a radius has only length. (It is a line segment) use "units"

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