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Chapter 1: Problem 5

An angle with a measure between \(90^{\circ}\) and \(180^{\circ}\) is a(n) __________ angle.

Short Answer

Expert verified
Obtuse angle

Step by step solution

01

Understand the Range of the Angle

Recognize that the given angle is within the range of more than 90 degrees and less than 180 degrees.
02

Identify the Type of Angle

Recall the definition of different types of angles. An angle that is more than 90 degrees but less than 180 degrees is called an obtuse angle.
03

Conclusion

Based on the definitions, the angle in question is an obtuse angle.

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Key Concepts

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

Obtuse Angle
An angle that measures between 90 degrees and 180 degrees is referred to as an obtuse angle. To visualize it, imagine the angle that a partially opened book forms. The pages create an open space wider than a right angle (which is 90 degrees), but not wide enough to become a straight line (180 degrees). This is what we call an obtuse angle.

An obtuse angle is larger than a right angle but smaller than a straight angle.
  • Right angle: Exactly 90 degrees
  • Obtuse angle: Between 90 degrees and 180 degrees
  • Straight angle: Exactly 180 degrees

It鈥檚 important to understand this distinction because it helps in identifying and working with various angles in geometry and practical applications.
Angle Measurement
Angle measurement is a fundamental part of geometry. It tells us the 'openness' between two lines that meet at a point called the vertex. The standard unit of measuring angles is degrees, denoted by the symbol \(^{\circ}\).

Here are some common types of angles based on their measurement:
  • Acute angle: Less than 90 degrees
  • Right angle: Exactly 90 degrees
  • Obtuse angle: Between 90 degrees and 180 degrees
  • Straight angle: Exactly 180 degrees
  • Reflex angle: More than 180 degrees but less than 360 degrees

To measure an angle, we often use a protractor, a semi-circular tool marked in degrees from 0 to 180. By aligning it with the angle's vertex and base, we can see how many degrees separate the two arms of the angle.
Geometry Basics
Geometry is the branch of mathematics that deals with shapes, sizes, and properties of figures. Understanding angles is a key part of this subject. Let鈥檚 break down some basic concepts:
  • Point: A location in space without any size or dimension
  • Line: A straight one-dimensional figure that extends infinitely in both directions
  • Line segment: A part of a line with two endpoints
  • Angle: Formed by two rays (called the sides of the angle) sharing a common endpoint (called the vertex)

In geometry, angles are crucial in defining shapes and understanding their properties. For example, different types of triangles (such as acute, obtuse, and right) are classified based on their angles.

Geometry helps in various real-life applications, including engineering, architecture, and even art. Thus, understanding the basics of geometry can be very practical and useful.

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Most popular questions from this chapter

Eratosthenes Measures Earth Over 2200 years ago Eratosthenes read in the Alexandria library that at noon on June 21 a vertical stick in Syene cast no shadow. So on June 21 at noon Eratosthenes set out a vertical stick in Alexandria and found an angle of \(7^{\circ}\) in the position shown in the drawing. Eratosthenes reasoned that since the sun is so far away, sunlight must be arriving at Earth in parallel rays. With this assumption he concluded that Earth is round and the central angle in the drawing must also be \(7^{\circ} .\) He then paid a man to pace off the distance between Syene and Alexandria and found it to be \(800 \mathrm{~km}\). From these facts, calculate the circumference of Earth (to the nearest kilometer) as Eratosthenes did and compare his answer with the circumference calculated by using the currently accepted radius of \(6378 \mathrm{~km}\).

Convert each angle to decimal degrees. When necessary round to four decimal places. $$ 200^{\circ} 44^{\prime} 51^{\prime \prime} $$

A common speed for an electric motor is 3450 revolutions per minute. Saw blades of various diameters can be attached to such a motor. Determine the linear velocity in \(\mathrm{mi} / \mathrm{hr}\) for a point on the edge of a blade with each given diameter. $$ 12 \text { in. } $$

Find the degree measure of the smallest positive angle that is coterminal with each angle. $$ 400^{\circ} $$

Find the degree measures of two positive and two negative angles that are coterminal with each given angle. $$ 30^{\circ} $$
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