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How do you find the perimeter of a circle?

Pi is an irrational number, which means it never ends. In math, 3.1415 is used as a general approximation of pi. The diameter is simply the length of the line that cuts through the center of the circle. This formula can also be written as 2 pi r. The radius (r) is simply half of the diameter, so multiplying it by two gives the diameter, making this equation equivalent to the first.

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What formula would be used to convert 115 degrees Fahrenheit to Celsius?

To determine the degrees in Fahrenheit if the Celsius temperature is known, the formula to use is Tf = Tc x 9/5 + 32. Thus, if the Celsius temperature is 46 degrees and 9/5 is converted to its decimal equivalent or 1.8, the conversion to Fahrenheit is derived by 46 x 1.8 + 32 = 115 degrees Fahrenheit.When the Celsius temperature is known, a rough conversion for the sake of weather comparisons can be accomplished by simply doubling the Celsius temperature and adding 30. Using a Celsius temperature of 30 C as an example, the Fahrenheit rough equivalent is derived by 30 x 2 + 30 = 90 F.The Celsiu..

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What is dimensional analysis?

Conversion factors are equal to 1 due to the rules of algebra. For example, since both days and hours are units of time, by stating 24 hours is equal to one day, and dividing both sides by one day, the left side becomes the ratio for the conversion factor. Using algebra fundamentals, this ratio of 24 hours (one day), equals 1. Multiplying this factor by the number of days eliminates the unit "day," and the quantity is now expressed in hours. Dimensional analysis is useful in physical science, chemistry and engineering, where quantities are expressed in different units that need to be compared...

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What is the formula for finding the volume of a trapezoidal prism?

The student finds the area of the trapezoid first. If the smaller trapezoid base is 2 and the longer one is 4, she adds those two numbers together to get 6. Then she multiplies that number by the height of the trapezoid, 3, to get 18. Finally, she divides that by 2, which is the same as multiplying by 0.5, to get 9.To find the volume of the prism, the student multiplies the area of the trapezoid by the length of the prism. If the length of the prism is 10, then she multiplies 9 times 10 to get 90. Therefore, the volume of the trapezoid is 90. The unit depends on the original units the trapezoi..

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How do you find the equation of a line?

Find two points on the lineLook on the graph where the line appears, and use the number lines on the x- and y-axis to determine coordinates that appear on the line. Write the coordinates of the two points in ordered pairs so that they look like (x1, y1) and (x2, y2).Calculate the slope of the lineRemember that the standard form of a linear equation is y = mx + b, in which m refers to the slope and b refers to the y-intercept, or the place where the line crosses the y-axis. Find the slope (m) by subtracting the first y coordinate from the second, and the first x coordinate from the second, and ..

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How many edges does a dodecahedron have?

There are many different types of dodecahedron, such as the rhombic or pyritohedral dodecahedron. Both of these variations lack regular pentagonal faces, which means that all of their edge lengths are not the same. Different types of dodecahedrons have different numbers of edges.A regular dodecahedron is a highly symmetrical shape, having multiple lines of symmetry. There are other 12-sided shapes that have limited or no symmetry, usually consisting of a mixture of pentagonal, square or triangular faces.

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How many vertices does a hexagonal prism have?

In a regular hexagonal prism, the hexagons are equilateral and parallel, such that all the rectangles are the same size and connect to the hexagons at right angles. A hexagonal prism is an octahedron; an octahedron is a polyhedron having eight faces. There are over 257 convex octahedra that include the augmented triangular prism, heptagonal pyramid, hexagonal prism, truncated tetrahedron, according to Math World of Wolfram Research Incorporated.\nA hexagonal prism is a type of octahedron, which is a polyhedron that contains eight faces.

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Who introduced the radical sign?

The current version of the radical symbol is similar to the symbol for long division with a check mark at the front. The number under the radical is known as the "radicand." A small number, known as the "index," sometimes appears at the front of the radical above the check. This small number represents which root to take from the radicand. For instance, if a question asks about the cube root of 27, then 27 is the radicand and appears under the radical, while 3 is the index and is represented as a small number 3 above the check.\nAnother way to represent a radical is a number with a fractional ..

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How can you determine the parametric equation of a line?

Determine the two points on a lineFind two points on a line and record them as x-y coordinates. In cases where it is a straight line, it may be oriented such that the x and y values are all equal to zero. In a word question, these will most likely be given.Select the value for "t"Select a value for "t" that is a real number. A real number can be rational or irrational, but it can't be imaginary. An example of an imaginary number would be the root of a negative number.Insert the values into the equations Insert the values of "t", (x1, y1) and (x2, y2) into the parametric equations to deter..

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How do you write two and one tenth as a decimal in standard form?

According to Reference.com, to write a number in standard form — also called scientific notation — the number is expressed as a number between one and ten multiplied by some power of ten. To give an example, the number 3,000 in standard form would be equal to three times ten to the third power, which is the same as three times one thousand.

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