Externally Tangent Circles

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March 25, 2009 - 3:38pm
RTFVerterra
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Groups: Asian Development Foundation College, GILLESANIA Engineering Review Center

Two circles whose radii are 10 cm and 8 cm are tangent to a given horizontal line and tangent externally to each other at point A. If both circles lies above the line, how far is point A from the horizontal line?

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March 26, 2009 - 4:06pm
#1
Lj (not verified)
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Re: Externally Tangent Circles

tangent-circles.jpg

\sin \alpha = \frac{2}{8 + 10} = \frac{x}{8}
x = \frac{8}{9}

\text{required distance} = x + 8 = \frac{80}{9} \,\, \text{cm}

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March 31, 2009 - 4:05pm
#2
RTFVerterra
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User offline. Last seen 2 weeks 2 days ago. Offline
Joined: 18 Nov 2008
Groups: Asian Development Foundation College, GILLESANIA Engineering Review Center
Re: Externally Tangent Circles

Good Job Lj. I can see your skill in CAD is improving. How did you manage to create an arrowhead for the angle alpha?

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