Friday

November 28, 2014

November 28, 2014

Posted by **matt** on Friday, December 10, 2010 at 8:30am.

- geometry -
**Reiny**, Friday, December 10, 2010 at 10:02amarc-length = rß where ß is in radians

pi/2 = 2ß

ß= pi/4 radians, which is 45 degrees

or

the whole circumference would be 2(pi)r

= 4pi

now by a simple ratio ....

(1/2)pi/(4pi) = angle/360

4angle = 180

angle = 45

**Answer this Question**

**Related Questions**

Math rem - 2.Find the length of the arc in a circle if the radius of the circle ...

geometry - A 45 degree arc of circle D has the same length as a 30 degree arc of...

math - Whats the difference between an arc [of a circle]'s length and measure? ...

Geometry - What is the circumference of the circle if the radius is: 5x-My ...

Geometry - A 60 degree arc, of circle A, has exactly the same lenght as a 45 ...

Geometry - how to you solve: the radius of circle Z is 13.5 units long. Find the...

Geometry - If the length of arc of measure 80 is 12 pi inches long, find the ...

Trig - Find the radian measure of the central angle of a circle of radius r that...

Geometry - What is the radius if: degree of measurement of arc=30 length=1/3xy(...

Geometry - The measure of the central angle of a sector of a circle is ...