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**DarkTangent****Member**- Registered: 2017-07-03
- Posts: 20

Triangle has a right angle at , , and . Find the radius of the incircle of .Circle is the incircle of and is also the circumcircle of . The point is on , the point is on , and the point is on . If , , and , what is the measure of ?

Hi! I am in geometry and I have been working on these problems for a while. Please help!

*Last edited by DarkTangent (2017-07-28 04:22:48)*

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Hi DarkTangent,

I have fixed your LaTeX -- on this forum, you can type LaTeX inside [math] tags rather than dollar signs.

You can find some useful information **here**.

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,321

hi DarkTangent

I find it best to get a really good diagram first. I use some software called Sketchpad but you can also use geogebra which is free.

In the first question you can write an equation for DA in terms of ED, and then CD in terms of ED. Add and re-arrange to get ED.

In the second you should be able to work out YOX. The angle at the edge, YZX, is half this using angle properties of a circle.

Bob

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**DarkTangent****Member**- Registered: 2017-07-03
- Posts: 20

zetafunc wrote:

Hi DarkTangent,

I have fixed your LaTeX -- on this forum, you can type LaTeX inside [math] tags rather than dollar signs.

You can find some useful information

here.

Thanks! That helped a lot.

bob bundy wrote:

hi DarkTangent

I find it best to get a really good diagram first. I use some software called Sketchpad but you can also use geogebra which is free.

http://i.imgur.com/QVbD1by.gif

In the first question you can write an equation for DA in terms of ED, and then CD in terms of ED. Add and re-arrange to get ED.

In the second you should be able to work out YOX. The angle at the edge, YZX, is half this using angle properties of a circle.

Bob

On it!

All our dreams can come true if we have the courage to pursue them - Walt Disney

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