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Chapter 5: Problem 29

Are isosceles triangles always acute triangles? Explain your reasoning.

Short Answer

Expert verified
No, isosceles triangles are not always acute triangles. While it is possible for an isosceles triangle to be acute, it can also be obtuse or right depending on its angle measurements.

Step by step solution

01

Understanding the properties of isosceles triangles

An isosceles triangle is defined as a triangle that has two sides of equal length. The angles opposite these sides are of equal measure. However, there's no restriction regarding the measure of the angles, they could be less than, equal to, or more than 90 degrees. Therefore, an isosceles triangle could be acute, right, or obtuse.
02

Understanding the properties of acute triangles

An acute triangle is defined as a triangle in which all three internal angles are less than 90 degrees. Therefore, for a triangle to be acute, it doesn't matter whether it has equal sides or not. The crucial factor is the measurement of its angles.
03

Comparing isosceles and acute triangles

While isosceles triangles have two sides of equal length, acute triangles have all angles less than 90 degrees. Therefore, a triangle can be both isosceles and acute if it has two sides of equal length and all its angles measuring less than 90 degrees. However, not all isosceles triangles are acute; an isosceles triangle can also be a right or obtuse triangle.

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Key Concepts

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

Acute Triangles
Acute triangles are a fascinating subset of triangles where each of the interior angles is less than 90 degrees. In these triangles, the angles are always small, making the triangle appear sharp and narrow.

To identify an acute triangle, simply check the angles:
  • All angles must be less than 90 degrees.
  • The sum of the angles should still equal 180 degrees, as with any triangle.
Acute triangles can take various shapes and include different types, such as scalene, isosceles, or equilateral, as long as all angles remain acute.
Triangle Properties
Triangles come with a set of fundamental properties that are essential to understand. These properties apply to all triangle types and provide insight into their structure.

Some key properties include:
  • The sum of the interior angles of any triangle is 180 degrees.
  • A triangle's external angle is equal to the sum of the opposite two internal angles.
  • The length of one side must always be less than the sum of the other two sides.
Understanding these properties helps in solving various geometric problems and identifying the type and nature of triangles.
Types of Triangles
Triangles are classified into different types based on their sides and angles. This classification is crucial for solving geometry problems and understanding their properties.

Based on sides, triangles can be:
  • Equilateral: All sides are equal, and all angles are 60 degrees.
  • Isosceles: Two sides are equal, and the angles opposite these sides are equal.
  • Scalene: All sides and angles are different.
Based on angles, triangles can be:
  • Acute: All angles are less than 90 degrees.
  • Right: One angle is exactly 90 degrees.
  • Obtuse: One angle is greater than 90 degrees.
By understanding these types, one can easily navigate through different geometry scenarios and their specific requirements.

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Most popular questions from this chapter

In Exercises \(23-26,\) ind the measure of each acute angle in the right triangle. The measure of one acute angle is 5 times the measure of the other acute angle.

WRITING You know that a pair of triangles has two pairs of congruent corresponding angles. What is other information do you need to show that the triangles are congruent?

In Exercises \(9-12,\) place the \(\quad\) gure in a coordinate plane and 1 nd the indicated length. a right triangle with leg lengths of 7 and 9 units; Find the length of the hypotenuse.

THOUGHT PROVOKING Choose one of the theorems you have encountered up to this point that you think would be easier to prove with a coordinate proof than with another type of proof. Explain your reasoning. Then write a coordinate proof.

PROOF Triangular postage stamps, like the ones shown, are highly valued by stamp collectors. Prove that \(\Delta \mathrm{AEB} \cong \Delta \mathrm{CED}\) . (See Example \(5 . )\) Given \(\overline{\mathrm{AB}} \square \overline{\mathrm{DC}}, \overline{\mathrm{AB}} \cong \overline{\mathrm{DC}}, \mathrm{E}\) is the midpoint of \(\overline{\mathrm{AC}}\) and \(\overline{\mathrm{BD}}\). Prove \( \Delta \mathrm{AEB} \cong \Delta \mathrm{CED}\)
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