Similar Polygons

Use ratios and corresponding parts in similar polygons.

Lesson 2 of 53 parts Practice Flashcards

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Corresponding Parts

Objective: Solve problems involving corresponding parts.

Similar polygons have equal corresponding angles and proportional corresponding sides.

Worked examples

Try itTwo similar polygons have corresponding angles; one is 51°. What is the other?Show answer

51°. Corresponding angles of similar polygons are congruent.

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Objective: Solve problems involving corresponding parts.

Similar polygons have equal corresponding angles and proportional corresponding sides.

Worked examples

Try itTwo similar polygons have corresponding angles; one is 51°. What is the other?Show answer

51°. Corresponding angles of similar polygons are congruent.

Objective: Solve problems involving similarity ratios.

A similarity ratio compares corresponding sides in the same order.

Worked examples

Try itA side of length 4 corresponds to a side of length 8. What is the scale factor from first to second?Show answer

2. Divide corresponding image length by original length.

Objective: Solve problems involving perimeter and area ratios.

If linear scale factor is k, perimeters scale by k and areas scale by k².

Worked examples

Try itA figure with perimeter 9 is enlarged by scale factor 3. New perimeter?Show answer

27. Perimeter scales linearly by 3.

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