A flat surface with no thickness that extends forever.
What is a plane?
100
An angle that has a measure between 0 and 90 degrees. "So small and cute!"
What is an acute angle?
100
A flat shape with four straight sides.
What is a quadrilateral?
100
The formula for the area of a parallelogram.
What is A=bh?
200
A triangle that has an angle less than 90 degrees.
What is an acute triangle?
200
The same shape and size. Of the same measure.
What is congruent?
200
Two angles with measures that add up to 180 degrees. They don't need to be next to each other but they need to add up to 180 degrees.
What are supplementary angles?
200
A four sided flat shape where all interior angles are right angles (90 degrees) and opposite sides are parallel and of equal length.
What is a rectangle?
200
The formula used to find the diameter of a circle, if you know the radius. In other words, the relationship between the diameter and the radius of a circle.
What is d=2r?
300
A flat shape with four straight sides.
What is a quadrilateral?
300
Two lines on a plane that never meet. The two lines are always the same distance from each other.
What are parallel lines?
300
Two angles that have a common side and a common vertex, but do not overlap. "Neighbor angles"
What are adjacent angles?
300
A triangle with all three sides of equal length. All interior angles will measure 60 degrees.
What is an equilateral triangle?
300
The formula used to find the area of a triangle.
What is A=1/2(b)(h)?
400
A four sided flat shape with straight sides where opposite sides are parallel.
What is a parallelogram?
400
Lines that are at right angles (90 degrees) with each other.
What are perpendicular lines?
400
Two angles with measures that add up to 90 degrees. They don't have to be next to each other, they just have to add up to 90 degrees.
What are complementary angles?
400
A triangle with two equal sides.
What is an isosceles triangle?
400
The formula used to find the circumference of a circle.
What is C=pi(d)? Or what is C=pi(2)(r)?
500
A triangle that has an angle greater than 90 degrees.
What is an obtuse triangle?
500
A point where two or more straight lines meet. A corner. The point of an angle.
What is a vertex?
500
An angle with a measure between 90 and 180 degrees.
What is an obtuse angle?
500
A triangle with all sides of different lengths.
What is a scalene triangle?
500
The formula used to find the area of a circle.
What is A=pi(r)^2?
What is Area equals pi times the radius squared?