Mathematics Grade 10 15 min

Choose numbers with a particular quotient

Choose numbers with a particular quotient

Tutorial Preview

1

Introduction & Learning Objectives

Learning Objectives Define a quotient in the context of geometric similarity. Identify the quotient as the scale factor between similar figures. Generate pairs of numbers that satisfy a given quotient (scale factor). Apply the concept of a particular quotient to solve for unknown side lengths in similar polygons. Verify if two figures are similar by checking if the quotients of their corresponding sides are constant. Use a given quotient to determine the ratio of perimeters and areas of similar figures. Ever tried to resize a picture on your phone without distorting it? 🖼️ You were actually choosing numbers with a particular quotient to keep the proportions right! This tutorial explores the core concept of similarity: the constant quotient, or ratio, that links proportional...
2

Key Concepts & Vocabulary

TermDefinitionExample QuotientThe result obtained by dividing one quantity by another. In the context of similarity, it is the ratio between corresponding measurements of two figures.If a large triangle has a side of length 15 and the corresponding side of a smaller, similar triangle is 5, the quotient is 15 ÷ 5 = 3. RatioA comparison of two numbers by division. It expresses the relative size of two quantities.The ratio of 8 to 4 can be written as 8:4, 8/4, or 2. This means the first number is twice as large as the second. ProportionAn equation that states that two ratios are equal. Proportions are the foundation for solving problems with similar figures.The equation 6/3 = 10/5 is a proportion because both ratios simplify to 2. Similar FiguresTwo geometric figures that have the same shape...
3

Core Formulas

The Proportionality Rule \frac{\text{side}_A'}{\text{side}_A} = \frac{\text{side}_B'}{\text{side}_B} = k For two similar figures, the quotient of any pair of corresponding sides is a constant value, known as the scale factor (k). This rule is used to find missing side lengths. Generating Numbers with a Quotient \text{new number} = k \times \text{original number} To find a new number that has a specific quotient (k) relative to an original number, multiply the original number by the quotient (scale factor). Quotient of Perimeters and Areas \frac{\text{Perimeter}'}{\text{Perimeter}} = k \quad \text{and} \quad \frac{\text{Area}'}{\text{Area}} = k^2 If the quotient of side lengths (scale factor) is k, the quotient of the perimeters is also k, but the...

4 more steps in this tutorial

Sign up free to access the complete tutorial with worked examples and practice.

Sign Up Free to Continue

Sample Practice Questions

Challenging
The area of polygon A is 72 sq units and the area of a similar polygon B is 50 sq units. If a side in polygon A is 12 units long, what number must be chosen for the length of the corresponding side in polygon B?
A.8.33
B.10
C.14.4
D.9
Challenging
Triangle ABC has side lengths x, x+4, and 15. A similar triangle, DEF, has corresponding side lengths 5, 7, and y. To maintain a constant quotient, what must be the value of x?
A.5
B.6
C.8
D.10
Challenging
In right triangle ABC (right-angled at C), an altitude CD is drawn to the hypotenuse AB. This creates two smaller triangles, ADC and CDB, which are similar to ABC. If AD = 9 and DB = 16, what length must be chosen for the altitude CD to satisfy the similarity quotient between ΔADC and ΔCDB?
A.12.5
B.7
C.12
D.15

Want to practice and check your answers?

Sign up to access all questions with instant feedback, explanations, and progress tracking.

Start Practicing Free

More from Similarity

Ready to find your learning gaps?

Take a free diagnostic test and get a personalized learning plan in minutes.