2U questions (1 Viewer)

the_matrix · Jan 31, 2016

How do I do these questions

My friend figured how to do the first question with circle geometry but my teacher doesn't permit that

http://s12.postimg.org/mj9uh4gvh/image.jpg

InteGrand · Jan 31, 2016

the_matrix said:
How do I do these questions

My friend figured how to do the first question with circle geometry but my teacher doesn't permit that

http://s12.postimg.org/mj9uh4gvh/image.jpg

$\noindent For the circle one, let the radius of the circle be $r$ (in metres), and let the circle's centre be $O$. Then $OD = r-0.1$, $OC=r$, and $CD = 1$ (all units in metres). We can then use Pythagoras in $\triangle OCD$ to obtain a quadratic to solve for $r$.$

2U questions (1 Viewer)

the_matrix

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InteGrand

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