- #1
nmnna
- 22
- 3
- Homework Statement
- In figure ##\angle{ABC} = 90^\circ = \angle{BCD}, \ \angle{ACB} = 41.45^\circ, \ \angle{CBD} = 32.73^\circ, \ BC = 10##cm. Calculate ##AB, \ CD## and ##\angle{AEB}##
- Relevant Equations
- ##\tan{\alpha} = \frac{opposite \ side}{adjacent \ side}##
The Figure
My Attempt at Solution
##\tan{ACB} = \frac{AB}{BC}, \ \tan41.45^\circ = \frac{AB}{10} \Rightarrow AB = 10\tan45.41^\circ \approx 8.83##cm
Similarly
##\tan{CBD} = \frac{CD}{BC}, \ \tan32.73^\circ = \frac{CD}{10} \Rightarrow CD = 10\tan32.73^\circ \approx 6.43##cm
After this I checked the answer in my textbook, and instead of 6.43cm the answer for ##CD## was 4.40cm.
I thought that there was a typo in the problem, so instead of ##32.73^\circ##, I tried ##23.73^\circ##, and surprisingly the answer matches with the one in the textbook.
So I'd like to know if it really is a typo or my solution is wrong.
And I can't find the angle required in the problem, so I'd be grateful if you give me some hints for finding this angle.
My Attempt at Solution
##\tan{ACB} = \frac{AB}{BC}, \ \tan41.45^\circ = \frac{AB}{10} \Rightarrow AB = 10\tan45.41^\circ \approx 8.83##cm
Similarly
##\tan{CBD} = \frac{CD}{BC}, \ \tan32.73^\circ = \frac{CD}{10} \Rightarrow CD = 10\tan32.73^\circ \approx 6.43##cm
After this I checked the answer in my textbook, and instead of 6.43cm the answer for ##CD## was 4.40cm.
I thought that there was a typo in the problem, so instead of ##32.73^\circ##, I tried ##23.73^\circ##, and surprisingly the answer matches with the one in the textbook.
So I'd like to know if it really is a typo or my solution is wrong.
And I can't find the angle required in the problem, so I'd be grateful if you give me some hints for finding this angle.