Thread: Trigonometric ratio problem

I don't know how to do the questions below↓ Can anyone help me to solve this question? Thanks.

Please help, thx.

In the first part

Therefore the distance

Speed = Distance Time = metres per second

Thx a lot.

Originally Posted by pickslides

In the first part <--- shouldn't that read 250 * cot(75°)

Therefore the distance

Speed = Distance Time = metres per second

I really have some difficulties to understand your solution ....

so what is the correct answer?? Plz help.

Originally Posted by william24

so what is the correct answer?? Plz help.

Pickslides got

I got

So the values of the speed differ first at the 3rd decimal. Not much harm done.

I wanna know the steps and how the steps made, My maths is really poor
Thx for ur helping, earboth

The steps are the following. You need to find Dickie's walking speed.

.

You know "time travelled", so you only need to find "distance travelled."
You can apply Pythagoras' theorem to find the distance from D to A if you know AB and BD.
AB is given (350 meters), and BD = CD + 300 meters, so you need to find CD, which you can derive from the fact that CE as well as the angle at D are given:

,

so , and .

Now ,
so the speed is meters per minute. (Convert to whatever unit required.)

Try to understand the steps above, and then solve problem (b) on your own.

Thx. It's clear

Originally Posted by tomasklos

Now

Of course, that should be .