![]() ![]() Use the degrees stated for the given angle to calculate chord length. Calculate the circumference for the part of circle for the degrees stated.Ĭhords: A chord is a line that connects two points on the circumference of the circle. Perimeter of squares and rectangles: (length × 2) + (width × 2)Ĭylinder volume: πr 2h (where r = radius and h = height)Īrcs: Arc length is a partial distance along the outside of a circle. Linear equation: y = mx + b ACT Math Formulas – Plane GeometryĪrea of square or rectangle: length × width If slope is 2, slope of perpendicular line = – 1/ 2 Perpendicular lines: The slopes of perpendicular lines are negative reciprocals. Parallel lines: Parallel lines have the same slope. Point-slope formula: (y – y 1) = m(x – x 1) Slope-intercept formula: y = mx + b ( where m = slope b = y intercept and x and y are points on the graph) Slope formula: m = (y 2 – y 1)/ (x 2 – x 1) For the y-intercept, substitute 0 for x and solve. X and y intercepts: For the x-intercept, substitute 0 for y and solve. Midpoints: Midpoint x = (x 1 + x 2) ÷ 2 Midpoint y = (y 1 + y 2) ÷ 2 Probability: Event ÷ Sample Space ACT Math Formulas – Coordinate Geometry Range= 7 – 1 = 6 ACT Formula – Probability Mode: number that is most frequent in the setĮxample data set: 1, 2, 3, 1, 4, 5, 2, 1, 7 Median: middle number in set when items are in order Mean: sum of the numbers ÷ amount of items in set However, this sheet may not be electronically reproduced or posted on online forums or document-sharing platforms. You may print this ACT Math Formulas Cheat Sheet for your own reference.
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