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2. Ratio - Wikipedia

   en.wikipedia.org/wiki/Ratio

   Ratio. In mathematics, a ratio (/ ˈreɪʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and ...

3. Proportion (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Proportion_(mathematics)

   Proportion (mathematics) A proportion is a mathematical statement expressing equality of two ratios. [1][2] a and d are called extremes, b and c are called means. Proportion can be written as , where ratios are expressed as fractions. Such a proportion is known as geometrical proportion, [3] not to be confused with arithmetical proportion and ...

4. Mnemonics in trigonometry - Wikipedia

   en.wikipedia.org/wiki/Mnemonics_in_trigonometry

   Quadrant 3 (angles from 180 to 270 degrees, or π to 3π/2 radians): T angent and cotangent functions are positive in this quadrant. Quadrant 4 (angles from 270 to 360 degrees, or 3π/2 to 2π radians): C osine and secant functions are positive in this quadrant. Other mnemonics include: All S tations T o C entral [6]

5. Tape diagram - Wikipedia

   en.wikipedia.org/wiki/Tape_diagram

   Tape diagram. A tape diagram is a rectangular visual model resembling a piece of tape, that is used to assist with the calculation of ratios and addition, subtraction, and commonly multiplication. It is also known as a divided bar model, fraction strip, length model or strip diagram. [citation needed] In mathematics education, it is used to ...

6. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics, most notably in Euclid's Elements. [4] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions ), until the 16th and 17th centuries, when algebra [ a ...

7. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   t. e. The number π (/ paɪ /; spelled out as " pi ") is a mathematical constant that is the ratio of a circle 's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.