Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -




Not registered yet?

#1 2005-11-25 00:12:31



Help a dad - Triangles


My kid brought some homework back and I sat down to help...... And got stuck *blush*
Well, his homework was easy, find the missing length or angle of a triangle etc.  We finished that with no problems and I felt quite happy I seemed to of helped, but then he asked me about angles of a triangle -
Why are the angles always an exact figure, like 45 degrees or 61 degrees.

I should of just said, thats what the book says, but no, I went into explaining that the angles can have decimals and tried to explain about the Angle being built with Degrees and minutes / secs ... This sank in and then he said, -
What tangent should be used for a 32.47 degree angle  ?

I grinned and opened the Trigonometric table page and found 32 degrees = 0.625
and 33 degrees = 0.649.. And said it lies within these too tangents.

But.... I couldn't explain what the exact tangent to use would be. I told him we'd revisit the problem and so here i am.... I've searched the net and havent found any such precise tangent tables or anything which will help me to understand and explain better the solution.

Sorry its a long one... Any help on this would be appreciated.


#2 2005-11-25 03:46:40



Re: Help a dad - Triangles

A scientific calculator could tell you.

The calculator in the 'accessories' bit of your computer has a scientific mode, or you could use Microsoft Excel and put

=tan(radians([angle])), where [angle] is the angle that you want the tangent of in degrees. That would tell you the value to at least 10 decimal places, I should think.

Why did the vector cross the road?
It wanted to be normal.

Board footer

Powered by FluxBB