Finding an unknown side of a right angled triangle 2012

1. Finding an unknown side of a right angled triangle . TAKE NOTE
O
TanA =
A
Say angle is 30o
True Values (2 dp) Example, anytime we come across a right-
angled triangle with a known angle we
can find an unknown side if we are given
the value of one other side.
Tan 30o = 0.58
h h
Tan 300 =
75
⇒ h = 75Tan 300
⇒ h = 75x 0.58 = 43.5m
30o
75 m

2. Now use the sane workings to find the unknown side of your right angled triangle
Explain every step .
Clues
Find length x
Find area of
triangle and times
by 2
Add result to area
of square in
middle
Times by length
of trench

3. Go to Unit 3.
Mathematics in Construction and the built Environment.
complete task 4
Insert your answers under the questions
Name and save your file with the following
Your Name
Asst1
Maths in construction
2012