# Math year 10 3d trig question (1 Viewer)

#### 4unitmath

##### New Member
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

##### Sleep Deprived Entity
Moderator
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...

#### Attachments

• 47.2 KB Views: 304
Last edited:

#### RealiseNothing

##### what is that?It is Cowpea
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

##### Sleep Deprived Entity
Moderator
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...

##### Member
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

##### Well-Known Member
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.