Which angle type is exactly 90 degrees?

Which angle type is exactly 90 degrees?

• A. Obtuse
• B. Acute
• C. Straight
• D. Right

Answer: (D)

A right angle is defined as an angle that measures exactly 90 degrees. This is a foundational concept in geometry and is significant in various applications, including construction, carpentry, and design, where precise right angles are essential. Understanding the characteristics of different types of angles can help solidify why a right angle is distinctly defined. An obtuse angle measures more than 90 degrees but less than 180 degrees, indicating that it opens wider than a right angle. An acute angle, on the other hand, measures less than 90 degrees, meaning it is sharper than a right angle. A straight angle measures exactly 180 degrees, forming a straight line rather than a right angle. Thus, the only angle type that fits the definition of being exactly 90 degrees is a right angle. This specific measurement is fundamental in both mathematical theory and practical applications, making it crucial to recognize and understand its characteristics.

A right angle is defined as an angle that measures exactly 90 degrees. This is a foundational concept in geometry and is significant in various applications, including construction, carpentry, and design, where precise right angles are essential.

Understanding the characteristics of different types of angles can help solidify why a right angle is distinctly defined. An obtuse angle measures more than 90 degrees but less than 180 degrees, indicating that it opens wider than a right angle. An acute angle, on the other hand, measures less than 90 degrees, meaning it is sharper than a right angle. A straight angle measures exactly 180 degrees, forming a straight line rather than a right angle.

Thus, the only angle type that fits the definition of being exactly 90 degrees is a right angle. This specific measurement is fundamental in both mathematical theory and practical applications, making it crucial to recognize and understand its characteristics.