Urgent- need help with maths question

the last question. I've done it twice, and last time I got 15 when the answer was 14 (basically I'm getting 1 degree more each time). It says round to the nearest whole number. What am I doing wrong?

Someone else please attempt this question and try to explain to me where I'm failing?

thank you

1+1 = windows.

sorry I can't help loool good luck with your exam.

I get 13.43

13.43..... is the correct accurate answer
but i think that mymaths (guessing where you got this question from) rounds every number during the process so you will get 14.47.... which rounds to 14

Are you rounding wrong?

What method are you using? I would just find the whole angle and the lower one using SOHCAHTOA and then just takeaway (remember to store both numbers in your memory to avoid rounding errors.)

Work out AC, work out AD. Now use the Cosine rule and rearrange to fine x

13.43..... is the correct accurate answer
but i think that mymaths (guessing where you got this question from) rounds every number during the process so you will get 14.47.... which rounds to 14

And yes, as donutellme said it can be worked out with the cosine rule - but as i said, this lesson is just on basic trigonometry, assuming you don't know about the cosine rule. Can you spot another method through which the answer can be worked out here?

I assumed angle CAD = angle DAB, as they share 2 equal sides, but my answers are off by 1 degree.

donutellme - yes, you are right - it can be worked out by that method, but this lesson is purely on SOHCAHTOA trigonometry, assuming you don't yet know what the cosine rule is. Therefore, there must be another way to solve this.

I did it your method and the answer is right though;

worked out both hypotenuses with pythagoras.

/ = over, divided by

cos CAD = 20.74246851^2+22.82542442^2-5.5^2/2xbxc

= 921/946.9112945 = 0.9726359854

then inverse cos of answer = 13.4 = 13


arithmeticae - it's definitely not a problem with the rounding. I keep all values the same in my calc (don't round off until the end).

And yes, as donutellme said it can be worked out with the cosine rule - but as i said, this lesson is just on basic trigonometry, assuming you don't know about the cosine rule. Can you spot another method through which the answer can be worked out here?

I assumed angle CAD = angle DAB, as they share 2 equal sides, but my answers are off by 1 degree.

donutellme - yes, you are right - it can be worked out by that method, but this lesson is purely on SOHCAHTOA trigonometry, assuming you don't yet know what the cosine rule is. Therefore, there must be another way to solve this.

I did it your method and the answer is right though;

worked out both hypotenuses with pythagoras.

/ = over, divided by

cos CAD = 20.74246851^2+22.82542442^2-5.5^2/2xbxc

= 921/946.9112945 = 0.9726359854

then inverse cos of answer = 13.4 = 13


arithmeticae - it's definitely not a problem with the rounding. I keep all values the same in my calc (don't round off until the end).

And yes, as donutellme said it can be worked out with the cosine rule - but as i said, this lesson is just on basic trigonometry, assuming you don't know about the cosine rule. Can you spot another method through which the answer can be worked out here?

I assumed angle CAD = angle DAB, as they share 2 equal sides, but my answers are off by 1 degree.