A dilation in math is a transformation that resizes a figure — either enlarging or shrinking it — by a scale factor, from a fixed point called the center of dilation. The shape's proportions stay the same; only its size changes. Dilation is one of the four main geometric transformations, and it produces figures that are similar, not congruent, to the original.

Symmetry in math means a shape or figure looks identical on both sides of a dividing point, line, or axis after being folded, rotated, or reflected. A shape is symmetrical when one part is a mirror image of the other. The three main types of symmetry in math are line symmetry (reflective symmetry), rotational symmetry, and point symmetry.

A reflection in math is a geometric transformation that flips a shape or point across a line called the line of reflection, producing a mirror image. The original figure and its reflection are congruent — same size and shape — but appear reversed. The line of reflection acts like a mirror. Common lines of reflection include the x-axis, y-axis, and the line y = x.

ACT Math prep focuses on six content areas: Pre-Algebra, Elementary Algebra, Intermediate Algebra, Coordinate Geometry, Plane Geometry, and Trigonometry. The test is 60 questions in 60 minutes. Effective preparation means mastering core formulas — including the quadratic formula, slope, area, the Pythagorean theorem, and basic trig ratios — and practicing under timed conditions. No formulas are provided on test day, so memorization and application are essential.

To calculate the area of a Rectangle multiply its length by its width.

Formula:  Area = Length × Width  (also written A = l × w)The result is always expressed in square units. If the sides are in centimeters, the area is in cm².Example: A rectangle with a length of 8 cm and a width of 5 cm has an area of 8 × 5 = 40 cm².