Indirect Measurement. Indirect Measurement: Allows you to use properties of similar polygons to find distances or lengths that are difficult to measure.

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Presentation transcript:

Indirect Measurement

Indirect Measurement: Allows you to use properties of similar polygons to find distances or lengths that are difficult to measure directly. When you use indirect measurement to find unknown lengths, you must first identify the corresponding sides of the similar triangles and the known lengths into a proportion.

At the same time that Karen’s shadow was 0.8 meter, a flagpole’s shadow was 33.6 meters. If Karen is 1.5 meters tall, how tall is the flagpole?

A fire hydrant 2 2/3 feet high casts a 5 ¼ foot shadow. How tall is a lamppost that casts a 30-foot shadow at the same time?

The two triangles shown in the figure are similar. Write and solve a proportion to find the distance d 180 m T S d m 400 m 350 m V W X

The right triangles in the figure are similar. Write and solve a proportion to find the distance. d m 1.2 m 0.4 m 1.4 m