Question

Monica has a lawn, ABCD. She has placed a watering hose, BD.
-Monica plans to put a fence along the length AD of her lawn. What is the length of the fence required?

Answer 1

First find BD .. do you know how?

Answer 2

yeah one second

Answer 3

30*

Answer 4

yess:D ... now you have an angle and a side of a right triangle... What do u think we should do?

Answer 5

use a trig function?

Answer 6

yeh which one?

Answer 7

hmm.. either sec or cosec?

Answer 8

well you want to find AD and you have BD
remember
Sine=opposite/hypotenuse
cosine= adjacent/hypotenuse
Tan=opposite / adjacent

so for the angle 60 and the sides AD and BD which one do u think will work?

Answer 9

cosine? lol

Answer 10

lol Do u know what the length of the hypotenuse is?

Answer 11

oh. so its tangent!

Answer 12

Exactly:D

Answer 13

so AD=?

Answer 14

30 tan 60?

Answer 15

\[\tan( \theta )=\frac{opposite}{adjacent}\]opposite =30
adjacent=AD
so\[\tan(60)=\frac{30}{AD}\]therefore \[AD=\frac{30}{\tan(60)}\]

Answer 16

Thank you >.<!

Answer 17

:D ur welcome