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Posted by **CJ** on Monday, January 17, 2011 at 3:29pm.

- Math/Trig -
**bobpursley**, Monday, January 17, 2011 at 3:31pmangle*radius=arc

radius=7.7cm/(PI/7)=7.7*7cm/PI

check that.

- Math/Trig -
**bobpursley**, Monday, January 17, 2011 at 3:36pmI do want to point out that math teachers dont understand units and place value. "Round your answer to the nearest tenth"...what? cm, meter.

For instance, if you do that math...

answer: 17.1569029cm or 17.2cm or

0.171569029m or .2 m

Physics and chemistry teacher would agree, the problem should have stated

a) Round your answer to the nearest tenth cm, or

b) Round your answer to the nearest tenth meter, or

c) round your answer to two (or desired) significant digits.

Because the arc was measured to two significant digits (7.7cm), the answer could be nor more than two, or 17cm.

- Math/Trig -
**CJ**, Monday, January 17, 2011 at 3:58pmit says to find the radius

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