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Knowledge base
More explainers from the knowledge base. Each one names what you need to know first, works through the method, and says where it usually goes wrong.
Examples ConvertersCelsius to Fahrenheit Examples: 10 ConversionsTen conversions, including the two that are not conversions at all — a difference and a kelvin shift.
Concept ConvertersCelsius and Fahrenheit: Why Two Scales ExistTwo scales, two different starting points and two different degree sizes. Every awkward part of converting between them comes from that.
Mistakes Trigonometry5 Common Radian Mistakes and How to Catch ThemOne of these is not an arithmetic slip at all — it is a setting on your calculator, and it produces confident wrong answers all the way through a paper.
Examples TrigonometryDegrees to Radians Examples: 10 Worked ConversionsTen conversions, and one arc length at the end to show what the exact form is for.
Concept TrigonometryWhat Is a Radian? Angle Measured by ArcA degree is a convention. A radian is a measurement the circle makes of itself, which is why the formulas come out clean.
Mistakes Basic Math5 Common Square Root MistakesFour of the five are caught by comparing your answer's decimal with the original. It takes five seconds.