Determining Height Without trigonometry how can you determine the height of something? Create a word problem whereas to determine the height of something using trigonometry to solve it. 

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rcmath's profile pic

rcmath | High School Teacher | (Level 1) Associate Educator

Posted on

Let's suppose we need to find the height of a pole, but it is rather difficult on us to measure vertically let's consider the following alternative. 

Problem: You are standing close to a pole. At the same time of the day you cast a shadow of x meter and the pole of y meters. We know your height to be h meters, find the height T of the pole.

Solution: Using proportions to solve the problem,
              h/x=T/y=>T=(h*y)/x

 

elekzy's profile pic

elekzy | Student, Grade 11 | (Level 1) Valedictorian

Posted on

for example....

Calculate the height of a tree 24m away from Tom, given the area of 72m.

A=1/2bh

72m=(24/2)*h

72=12h

h=72/12

h= 5m

This method is usually given when the area and base is given...or......

elekzy's profile pic

elekzy | Student, Grade 11 | (Level 1) Valedictorian

Posted on

You can also use the formula for solving the Area of a Triangle:

1/2 base*height....depending on the question

 

najm1947's profile pic

najm1947 | Elementary School Teacher | (Level 1) Valedictorian

Posted on

It is an interesting problem. You are in a plain ground and see a beautiful tall tree. You do not have any sophisticated instrument to find its height but are interested in finding it's height. What to do?

Activity:

Take two straight poles one long and the other short. Fix the taller at about 20 feet from the tree vertically. Go further away from the tree in the same alignment so that on fixing the shorter vertically makes the tree top and the tops of the longer & shorter poles in a straight line. Measure the following:

Distance of longer pole from the tree, let it be L1

Distance of shorter pole from the longer pole, let it be L2

Height of longer pole above ground, let it be H1

Height of shorter pole above the ground, let it be H2

Solution:

Let height of tree be Ht

Using ratio and proportion, we get

(Ht-H1)/(H1-H2) = L1/L2

Ht = (L1-L2)*(H1-H2) + H1

Height of Tree is (L1-L2)*(H1-H2) + H1

and height of tree can be so determined using ratios and proportions without using trigonometry.

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