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Videos, worksheets, stories and songs to help Grade 8 students learn about indirect measurement (using similar triangles).

Indirect Measurements

Apply concepts of similar figures to solve indirect measurement problems

Learn to use concepts of proportions to solve problems in indirect measurement

Learn to use concepts of proportions to solve problems in indirect measurement

Indirect measurement is a method of using proportions to find an unknown length or distance in similar figures.

Two common ways to achieve indirect measurement involve

(1) using a mirror on the ground and

(2) using shadow lengths and find an object's height.

Method 1 measures the person's height and the distances between the person, mirror, and object.

Method 2 measures shadows and the person's height.

You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.