Mathematics

Cube with dimensions shown — Surface area formulas and volume formulas appear time and again in calculations and homework problems. Pressure is a force per area and density is mass per volume. These are just two simple types of calculations that involve these formulas. This is a short list of common geometric shapes and their […]

Surface Area Formulas and Volume Formulas of 3D Shapes

This entry was posted on June 25, 2017 by Todd Helmenstine (updated on January 18, 2019)

Trapezoid — Area formulas and perimeter formulas are formulas that pop up often in different homework problems. Examples include problems involving pressure, mechanical torque and electric resistance. You could just memorize these formulas, but why do that when this handy reference is available? Triangle Area Formula and Triangle Perimeter Formula A triangle […]

Area Formulas and Perimeter Formulas

This entry was posted on June 21, 2017 by Todd Helmenstine (updated on July 28, 2017)

Graphing Linear Functions Worksheet Answer Sheet — Linear functions are functions where the solution forms a straight line. This worksheet will give you a chance to practice graphing these functions. The equations included in this worksheet are all simple equations where the graph will fit on the included 10×10 grid. Download the PDF and sketch the graph […]

Graphing Linear Functions Practice Worksheet

This entry was posted on September 26, 2016 by Todd Helmenstine

Slope Intercept Example 1 Graph — Slope intercept form is a function of a straight line with the form y = mx + b where m is the slope of the line and b is the y-intercept. Slope refers to how steep the line changes as the values of x change where the y-intercept is where the […]

Slope Intercept Form – Equation of a Line Example

This entry was posted on September 21, 2016 by Todd Helmenstine

Graph of a Line 2 — What is slope? Simply put, slope refers to the steepness of a line. The larger the slope, the steeper the line. Slope is often referred to as ‘rise over run’ because it is calculated by the change in the vertical (rise) divided by the change in the horizontal (run). When […]

What Is Slope? How to Find the Slope of a ...

This entry was posted on September 17, 2016 by Todd Helmenstine (updated on September 20, 2016)

Squirrel and Nut Trigonometry Example — SOHCAHTOA is the mnemonic used to remember which sides of a right triangle are used to find the ratios needed to determine the sine, cosine or tangent of an angle. Here are a pair of SOHCAHTOA example problems to help show how to use these relationships. If you have no […]

SOHCAHTOA Example Problem – Trigonometry Help

This entry was posted on September 8, 2016 by Todd Helmenstine (updated on September 8, 2016)