# Figuring out angles and lengths from limited information

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• Jun 9th 2009, 02:42 PM
prettiestfriend
Figuring out angles and lengths from limited information
• Jun 9th 2009, 02:59 PM
TheEmptySet
Quote:

Originally Posted by prettiestfriend

Something is wrong with your angles

$\displaystyle 23^\circ +48^\circ \ne 69^\circ$

Start by looking there
• Jun 9th 2009, 03:14 PM
prettiestfriend
Oh.

Um well 48 is incorrect then, it should be 46 degrees. However, this has no effect on the results I got - I didn't use it in my calculations.
• Jun 9th 2009, 03:26 PM
TheEmptySet
Quote:

Originally Posted by TheEmptySet
Something is wrong with your angles

$\displaystyle 23^\circ +48^\circ \ne 69^\circ$

Start by looking there

$\displaystyle \tan(23)=\frac{BD}{BC}$

$\displaystyle \tan(69)=\frac{BD+AD}{BC}$

And you know BC.

So solve for BD then use it in the 2nd to find AD
• Jun 9th 2009, 06:18 PM
aidan
Quote:

Originally Posted by prettiestfriend
27.039

Your answer is correct.

However, 27.0 is closer to 27.039 than 27.1