Geometry: Similar Triangles and Ratios

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Questions and Answers

If the areas of two similar triangles are 36 cm² and 121 cm², what is the ratio of their corresponding sides?

  • 2:3
  • 4:7
  • 3:5
  • 6:11 (correct)

In triangle ΔPQR, if ray PS bisects ∠QPR with QS = 4.8 cm and SR = 3.6 cm, what is the ratio PQ : PR?

  • 3:4
  • 4:3 (correct)
  • 5:4
  • 2:3

If triangles ΔABC and ΔPQR are similar with sides AB: PQ = 4:5 and A(APQR) = 125 cm², what is the area of triangle AABC?

  • 87.5 cm²
  • 100 cm² (correct)
  • 156.25 cm²
  • 96 cm²

For two similar triangles with corresponding sides in the ratio 3:5, what is the ratio of their areas?

<p>9:25 (A)</p> Signup and view all the answers

Given a triangle with a vertical pole of 40 m casting a shadow of 20 m, what will be the length of the shadow of a 50 m tall tower?

<p>25 m (A)</p> Signup and view all the answers

If the area of two similar triangles is equal, what can be concluded about their corresponding sides?

<p>They are congruent. (B)</p> Signup and view all the answers

In ΔABC where PQ || BC and divides the triangle into two equal areas, how would you express BP/AB?

<p>1/2 (C)</p> Signup and view all the answers

In the context of similar triangles, if the sides of a smaller triangle are 4 cm, 5 cm, and 6 cm, what is the sum of the sides of the larger triangle if its perimeter is 90 cm?

<p>120 cm (A)</p> Signup and view all the answers

In a triangle where angle bisector AD divides side BC, what is the ratio of the areas A(ΔABD) to A(ΔACD)?

<p>AB:AC (B)</p> Signup and view all the answers

What is the relationship between the heights of two triangles having equal area when one is scaled by a factor?

<p>Heights are also in the same ratio. (D)</p> Signup and view all the answers

If the lengths AB and CD are perpendicular and measured as 3 cm and 4 cm respectively, what is the area of ΔABC?

<p>6 cm² (D)</p> Signup and view all the answers

If ΔABC and ΔPQR are similar and the ratio of their areas is 16:25, what is the ratio of their corresponding sides AB: PQ?

<p>4:5 (C)</p> Signup and view all the answers

If segments DH and GK are perpendicular to side EF, with respective heights of 12 cm and 20 cm, what can be said about the areas of triangles ADEF and GEF?

<p>A(DEF) is greater than A(GEF). (C)</p> Signup and view all the answers

Flashcards

Similar Triangles Area Ratio

If two triangles are similar, the ratio of their areas is equal to the square of the ratio of their corresponding sides.

Similar Triangles Side Ratio

If two triangles are similar, the ratio of their corresponding sides is constant.

Angle Bisector Theorem

In a triangle, the bisector of an angle divides the opposite side into segments that are proportional to the other two sides.

Triangles with Parallel Lines

If a line is parallel to one side of a triangle, it divides the other two sides proportionally.

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Triangle Similarity Tests

Various tests (e.g., AA, SSS, SAS) determine if two triangles are similar, meaning their angles and sides are proportional.

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Similar Triangles

Triangles with the same shape but not necessarily the same size. Corresponding angles are equal, and corresponding sides are proportional.

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Area Ratio of Similar Triangles

The ratio of the areas of two similar triangles is equal to the square of the ratio their corresponding sides.

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Similar Triangle Sides

In similar triangles, corresponding sides are proportional to each other.

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Triangle Angle Bisector Theorem

The angle bisector of a triangle divides the opposite side into segments proportional to the adjacent sides.

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Area of a Triangle with Parallel Lines

If a line is parallel to one side of a triangle, dividing the other two sides proportionally, then the smaller triangle formed has an area equal to the larger triangle's area multiplied by the ratio of the given side's segments.

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Congruent Triangles

Two triangles that have exactly the same size and shape.

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Area of Triangles with Equal Height

Triangles with equal heights have equal areas if their bases are equal in length.

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Proportional Sides in Similar Figures

The ratio of corresponding sides of similar figures (like triangles) are equal.

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