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Chapter 7: Problem 4

Fill in the blank(s). Two___________ and one_____________determine a unique triangle.

Short Answer

Expert verified
The correct filled sentence is: 'Two sides and one angle determine a unique triangle'

Step by step solution

01

Identify the possible attributes of a triangle

Let's start by identifying the basic attributes that can define a unique triangle. They could be its sides, angles, or a combination of both.
02

Match the numbers to these attributes

Now, looking at the numbers - 'two' and 'one' - in the statement, we need a combination of 'two' of one attribute and 'one' of another attribute to determine a unique triangle.
03

Fill in the blanks

Given that previous step, the most fitting option for the blanks in the sentence is 'Two sides and one angle determine a unique triangle'. This is under condition that the angle is in between the two sides, otherwise it would not result in a unique triangle.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Unique Triangle
When we talk about a unique triangle, we mean a triangle where the arrangement and measurement of its sides and angles are distinct. No other combination of sides and angles could form a triangle with the same shape and size.
A unique triangle can be formed by specific combinations of sides and angles. For instance:
  • Knowing two sides and the angle between them ensures that no other triangle can have the same measures.
  • Alternatively, three sides of specific lengths will also form a unique triangle. This is commonly referred to as the Side-Side-Side (SSS) condition.
Each of these conditions guarantees that there is only one possible triangle that can be formed.
Triangle Attributes
Triangles have several key attributes which define their shape and size. These include sides, angles, and the relationships between them. Understanding these attributes is crucial to solving problems related to triangles.
Key triangle attributes are:
  • Sides: The lengths of the edges of the triangle. The sides define the perimeter of the triangle.
  • Angles: The three angles inside the triangle add up to 180 degrees. This property is fundamental in various geometric calculations.
  • Area: The space enclosed within the triangle's sides. The area can be calculated from the lengths of its sides and angles.
  • Perimeter: The total length around the triangle, which can be found by adding up all the side lengths.
Sides and Angles
The relationship between the sides and angles in triangles is unique and crucial to their properties. This relationship helps in determining the shape and size of the triangle.
There are several ways sides and angles can determine the triangle type:
  • Two Sides and an Angle (SSA): A non-unique case unless the angle is between the given sides, as it's otherwise possible to form two different triangles.
  • Side-Angle-Side (SAS): When two sides and the included angle are known, the triangle is unique. This is because the angle gives a specific direction for the second side.
  • Angle-Side-Angle (ASA): If two angles and the included side are known, the third angle is determined, allowing a unique triangle construction.
  • Side-Side-Side (SSS): Knowing all three sides ensures that only one specific triangle shape can be made.
Understanding these combinations aids in recognizing how many different triangles can be formed from a set of given measurements.

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