ACT Math Formulas (Correct Answers)
Area of a CircleCorrect Answers∏r^2
Area of a RectangleCorrect AnswersBase X Height
Area of a SquareCorrect AnswersBase X Height
Area of a SectorCorrect Answers(n/360)(∏r^2)
Area of a TriangleCorrect Answers(1/2)(base)(height)
Volume of a CylinderCorrect Answers(∏r^2)h
CircumferenceCorrect Answers2∏r
Arc LengthCorrect Answers(n/360)(2∏r)
Pythagorean TheoremCorrect Answersa^2+b^2=c^2
Distance FormulaCorrect AnswersD= √((x2-x1)^2 + (y2-y1)^2)
(This is much more confusing than the actual formula, please just use this as a
reference to help memorize).
Slope FormulaCorrect AnswersM = (y2-y1)/(x2-x1)
Degrees of the Interior Angles of a QuadrilateralCorrect Answers360
Degrees of the Interior Angles of a TriangleCorrect Answers180
Degrees of Circumference of a CircleCorrect Answers360
Sum of 2 Consecutive Angles of a ParallelogramCorrect Answers180
integerCorrect AnswersWhole number
Rational NumberCorrect AnswersAny number that can be expressed as a fraction
where the denominator is not 0.
Examples: 2 can be expressed as 2/1, therefore all integers are rational numbers.
Any number that continues forever in a non-repetitive fashion is an irrational number
such as ∏.
Real NumberCorrect AnswersAny value that can be found on a number line.
Central AngleCorrect AnswersAngle formed by 2 radii
ParallelogramCorrect AnswersRectangle with opposite sides of equal length
PerimeterCorrect AnswersAdd the outside border
DiameterCorrect AnswersStraight line from one side of a circle to the other going
through the center
RadiusCorrect AnswersHalf the diameter
ArcCorrect AnswersSection of perimeter of a circle
SectorCorrect AnswersPiece of pie of a circle
ParallelCorrect AnswersTwo lines that lie on the same plane and never intersect
TransversalCorrect AnswersWhen a line intersects 2 parallel lines
Isosceles TriangleCorrect AnswersTwo sides and hence 2 interior angles are the same
Equilateral TriangleCorrect AnswersAll sides and hence all interior angles are the same
Right TriangleCorrect AnswersOne interior angle that equals 90 degrees
HypotenuseCorrect AnswersThe longest side of a right triangle which is always
opposite the right angle
Supplementary AngleCorrect AnswersTwo angles next to each other on a straight line,
and hence when added together always equal 180 degrees
Right AngleCorrect Answers90 degree angle
Complementary AnglesCorrect AnswersTwo angles inside of a right angle, and hence
when added together always equal 90 degrees
Area of a CircleCorrect Answers∏r^2
Area of a RectangleCorrect AnswersBase X Height
Area of a SquareCorrect AnswersBase X Height
Area of a SectorCorrect Answers(n/360)(∏r^2)
Area of a TriangleCorrect Answers(1/2)(base)(height)
Volume of a CylinderCorrect Answers(∏r^2)h
CircumferenceCorrect Answers2∏r
Arc LengthCorrect Answers(n/360)(2∏r)
Pythagorean TheoremCorrect Answersa^2+b^2=c^2
Distance FormulaCorrect AnswersD= √((x2-x1)^2 + (y2-y1)^2)
(This is much more confusing than the actual formula, please just use this as a
reference to help memorize).
Slope FormulaCorrect AnswersM = (y2-y1)/(x2-x1)
Degrees of the Interior Angles of a QuadrilateralCorrect Answers360
Degrees of the Interior Angles of a TriangleCorrect Answers180
Degrees of Circumference of a CircleCorrect Answers360
Sum of 2 Consecutive Angles of a ParallelogramCorrect Answers180
integerCorrect AnswersWhole number
Rational NumberCorrect AnswersAny number that can be expressed as a fraction
where the denominator is not 0.
Examples: 2 can be expressed as 2/1, therefore all integers are rational numbers.
Any number that continues forever in a non-repetitive fashion is an irrational number
such as ∏.
Real NumberCorrect AnswersAny value that can be found on a number line.
Central AngleCorrect AnswersAngle formed by 2 radii
ParallelogramCorrect AnswersRectangle with opposite sides of equal length
PerimeterCorrect AnswersAdd the outside border
DiameterCorrect AnswersStraight line from one side of a circle to the other going
through the center
RadiusCorrect AnswersHalf the diameter
ArcCorrect AnswersSection of perimeter of a circle
SectorCorrect AnswersPiece of pie of a circle
ParallelCorrect AnswersTwo lines that lie on the same plane and never intersect
TransversalCorrect AnswersWhen a line intersects 2 parallel lines
Isosceles TriangleCorrect AnswersTwo sides and hence 2 interior angles are the same
Equilateral TriangleCorrect AnswersAll sides and hence all interior angles are the same
Right TriangleCorrect AnswersOne interior angle that equals 90 degrees
HypotenuseCorrect AnswersThe longest side of a right triangle which is always
opposite the right angle
Supplementary AngleCorrect AnswersTwo angles next to each other on a straight line,
and hence when added together always equal 180 degrees
Right AngleCorrect Answers90 degree angle
Complementary AnglesCorrect AnswersTwo angles inside of a right angle, and hence
when added together always equal 90 degrees
