Math year 10 3d trig question (1 Viewer)

[4unitmath]

Can someone do this question?
A is the top and B is the base of a tower 15m high. From C, a point due south of B, the angle of elevation of A is 15° whilst from D, bearing 060° from B, the angle of elevation of A is 21°. Find the distance of CD correct to the nearest cm.

 

[RivalryofTroll]

I'm not too sure if my answer is correct but here's my attempt at it!
Re-check my calculations in your calculator to make sure that I didn't plug in the wrong values into my calculator!

Final Answer: 83 metres to the nearest metre... May be (probably is) incorrect though..

See attachment for working out...

 

[RealiseNothing]

I'm not too sure if my answer is correct but here's my attempt at it!
Re-check my calculations in your calculator to make sure that I didn't plug in the wrong values into my calculator!

Final Answer: 83 metres to the nearest metre... May be (probably is) incorrect though..

See attachment for working out...

I got this too. Except it's to the nearest cm not m, so 82.75cm.

 

[RivalryofTroll]

I got this too. Except it's to the nearest cm not m, so 82.75cm.

Yeah I got 82.75 as well but rounded it up to nearest whole number...

 

[jadenmaccas]

Can someone do this question?
A is the top and B is the base of a tower 15m high. From C, a point due south of B, the angle of elevation of A is 15° whilst from D, bearing 060° from B, the angle of elevation of A is 21°. Find the distance of CD correct to the nearest cm.

what makes this a 3D trig question?

 

[nightweaver066]

what makes this a 3D trig question?

It is a 3D trigonometry question as it not only includes the 2D planes (x and y), it has height as well.

 

[Shadowdude]

what makes this a 3D trig question?

Draw a diagram and see what happens.