Triangle that has three equalsides and three equal angles that are 60⁰.
Triangle that has one obtuse angle.
Triangle that has three acute angles.
Four sided Figure
Area of a Quadrilateral
A=base X height
• Quadrilateral with the following properties: 1. Opposite sides are parallel 2. Opposite sides are congruent 3. Diagonals bisect each other 4. Opposite angles are congruent
• Parallelogram that has all of those properties plus the following: 1. All angles are 90⁰ 2. Diagonals are congruent
• Parallelogram that has all of those properties plus the following: 1. All sides are congruent 2. Diagonals are perpendicular 3. Diagonals bisect corner angles
• Parallelogram that has all of those properties plus combines the properties of a rectangle and a rhombus
Sum of Interior Angles of a Polygon
(n − 2)180 0
Sum of Exterior Angles of a Polygon
C i R c Le S
Diameter of a circle
Circumference of a circle
C= 2 r RadiusCircumference
Area of a circle
A= r 2Area Radius
Arc of a Circle
• A sector is a region that is formed between two radii and the arc joining their end points
To find the area of a sector…..
r2360 Area of a Circle
Length of Arc
2 r360 Circumference of a Circle
Sum of all angles in a circle
Tangent to a Circle
• Tangent line is perpendicular to the radius at the point of tangency
Number of favorable outcomeTotal number of outcomes
the sum of a set of valuesthe total number of values in the set
Middle number in a set of numbers arranged in numerical order
average of the middle two numbers
Values that appear the most often in a set of numbers.
• Angle whose measure is between 0 and 90 degrees.
• Angle whose measure is between 90 and 180 degrees.
• Two angles that sum to 90 degrees.
An angle that is 90 degrees
• Two angles that sum to 180 degrees.
• An angle that’s measure is 180 degrees
• Angles that are opposite of each other when two lines cross• Vertical angles are congruent, so angles a and b are congruent in the image.
• A line that crosses two lines (they do not have to be parallel) creating special types of angles
• Angles in matching corners are corresponding.• In this image, a and e, b and f, d and h, d and g are corresponding.• If the transversal crosses two parallel lines, corresponding angles are then congruent.
Alternate Interior Angles
• The pairs of angles that are on opposite sides of the transversal but inside the other two lines are alternating interior angles• In this image, c and f, and d and e are alternating interior.• If the transversal crosses two parallel lines, AI angles are then congruent.
Alternate Exterior Angles
• The pairs of angles that are on opposite sides of the transversal but outside the other two lines are alternate exterior angles• In this image, a and h, and b and g are alternating interior.• If the transversal crosses two parallel lines, AE angles are then congruent.
Same Side Interior Angles
• Angles that are on the same side of the transversal and on the interior of the other two lines are same side interior.• In this image, 3 and 6, and 4 and 5 are SSI angles.• If the transversal crosses two parallel lines, SSI angles are supplementary.
Same Side Exterior Angles
• Angles that are on the same side of the transversal and on the exterior of the other two lines are same side exterior.• In this image, 2 and 7, and 1 and 8 are SSE angles.• If the transversal crosses two parallel lines, SSE angles are supplementary.