Geometry Geometry Math Forum

 May 5th, 2015, 12:12 PM #1 Newbie   Joined: Dec 2014 From: uk Posts: 10 Thanks: 0 Calculating area in circle question.. Ok... Here's my question, when calculating an area of a circle im getting totally different sizes by using different length types. Eg. A circle wih a radius of 400mm and an angle of 0.8 rad is showing up totally different results to a circle with a radius of 0.4m and an angle f 0.8 rad... After working it out and converting the results they differ. What am I missing here. May 5th, 2015, 12:23 PM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 2,949 Thanks: 1555 $\displaystyle A = \frac{\theta}{2} r^2$ $\displaystyle A = (0.4)(400 \, mm)^2 = 64000 \, mm^2$ $\displaystyle A = (0.4)(0.4 \, m)^2 = 0.064 \, m^2$ note ... $\displaystyle 1 \, m^2 = 10^6 \, mm^2$ so ... $\displaystyle 0.064 \, m^2 \times 10^6 \, mm^2/m^2 = 64000 \, mm^2$ same same. May 5th, 2015, 12:42 PM #3 Newbie   Joined: Dec 2014 From: uk Posts: 10 Thanks: 0 So it is... :/ Had bit of a dull moment. Tags area, calculating, circle, question Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Denis Geometry 5 May 2nd, 2015 12:00 PM joelphilippage Geometry 3 September 17th, 2014 03:53 PM yeoky Algebra 4 May 3rd, 2014 01:06 AM Mercury Algebra 6 February 19th, 2013 08:58 PM gus Algebra 1 April 17th, 2011 04:25 PM

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