Math Is Fun Forum

Hrslvr1612

Member

Registered: 2005-12-12

Posts: 13

Triangles

10) In ΔRST, the measure of  angle S is 142°. the length of line RS is 10. Find the length of the altitude from vertex R.

please help
greatly appreciated!!!

liuv

Member

Registered: 2006-05-14

Posts: 29

Re: Triangles

ΔRST is not  one an only:(

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I'm from Beijing China.

Sammmm

Guest

Re: Triangles

This is a complex problem - one which scientists have pondered over for years. I have recently discovered the truth, the solution to the problem.

As I was playing football with acquantinces, I realized that the ball I was playing with, was in fact a spherical shape. I delved further into this discovery and realized that it was a 360 degree shape. I took this one step furhter and realized that the same concept applied to all shapes and that the sum of all angles in a triangle is 180 degrees. So back to your problem:

180/3 and R is 142 that means that the sum of ST is 180-142.
So S is the square root of the altitude of the vertex of the squared root of the sum.

Evident as it now may be, I will spell it out to you. The answer is 16.

Yours sincerely,
Professor Adam Eugene Cornvy III. At the University of Oxbridge.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,423

Re: Triangles

I tried to make a diagram of the triangle in the problem. The altitude from vertex R lies outside the triangle!
Let the altitude from vertext R meet ST at point P.
Angle RSP 180 - Angle RST = 180 - 142= 38 degrees

Sin (Angle RSP) = PR/RS
Sin 38 = PR/RS,
we know RS = 10
Therefore, PR = 10 sin 38 = 10(0.61566)=6.1566

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

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