Define angle.
A figure formed by two rays with a common endpoint called the vertex.
What is a right angle?
An angle that measures exactly 90 degrees.
True or false: An acute angle is greater than 90 degrees.
FALSE
An acute angle measures less than 90 degrees.
Fill in the blank: A straight angle measures ______ degrees.
180
What is the sum of angles in a triangle?
The sum is always 180 degrees.
Define perimeter.
The total distance around the outside of a shape.
How do you calculate the perimeter of a rectangle?
Add the lengths of all four sides or use the formula: P = 2(l + w).
True or false: The perimeter of a square is four times the length of one side.
TRUE
The formula for the perimeter of a square is P = 4s.
What is an obtuse angle?
An angle that measures greater than 90 degrees but less than 180 degrees.
Fill in the blank: A full rotation is ______ degrees.
360
Define complementary angles.
Two angles that add up to 90 degrees.
What are supplementary angles?
Two angles that add up to 180 degrees.
True or false: A polygon must have at least three sides.
TRUE
The simplest polygon is a triangle.
How do you find the perimeter of a triangle?
Add the lengths of all three sides.
What is a reflex angle?
An angle that measures greater than 180 degrees but less than 360 degrees.
Fill in the blank: The interior angles of a quadrilateral sum to ______ degrees.
360
Define isosceles triangle.
A triangle with at least two sides of equal length.
What is the perimeter of a square with side length 5?
The perimeter is 20 units.
True or false: A circle has a perimeter.
FALSE
A circle has a circumference, not a perimeter.
What is the vertex of an angle?
The point where the two rays meet.
Fill in the blank: A triangle with all sides equal is called ______.
equilateral
Define angle bisector.
A ray that divides an angle into two equal parts.
What is the perimeter of a rectangle with length 4 and width 3?
The perimeter is 14 units.
True or false: The angle of elevation is measured from the horizontal up.
TRUE
It is used in various applications like surveying.
