Question

an angle that measures exactly 90 degrees is known as a angle.
an angle more than 90 degrees but less than 180 degrees is called an angle.
an angle that measures exactly 180 degrees is called a angle.
the tool used to measure angles is called a.
the formula to calculate the sum of interior angles of a polygon is $s=(n - 2)\times180^{circ}$, where $s$ is the sum and $n$ is the number of.

Explanation:

• For the first blank: By definition, an angle of 90 degrees is a right angle.
• For the second blank: Angles between 90 and 180 degrees are obtuse angles.
• For the third blank: A 180 - degree angle is a straight angle.
• For the fourth blank: The common tool to measure angles is a protractor.
• For the fifth blank: In the formula \(S=(n - 2)\times180^{\circ}\) for the sum of interior angles of a polygon, \(n\) represents the number of sides.

Answer:

right, obtuse, straight, protractor, sides