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FAQs

How do I write pseudo code for this: "input 3 side of a triangle and figure out if its scalene, isosceles, equilateral or right angle triangle?
I'm not gonna give you that exact pseudo code here, instead let's break down problem . There is two option to define any side of Triangle (taking input as well)... a. As Cartesian (or Polar) Coordinate of the intersecting point of any two adjacent sides b. Defining Each Sides with Equation. Lets start with easier one... (taking input as coordinate of three intersection point of adjacent sides of course)Once you have have all three points you can measure the length of each sides.Lucky in Triangle all sides are adjacent to others (that make the calculation whole lot easier). Use following Equation to find the length of each sides from their intersecting coordinates. r= √( (x1x2)^2+ (y1  y2)^2), where x1 adjacent to x2 and so on... & r is length of each side.Once you get all sides measured you're good to go for final stage...1. if all sides are same in length (which is a good news!) , the triangle is Equilateral and nothing else (that match your other criteria). Because, No Equilateral could be Right Angle. Wonder Why? Try recalling Pythagoras Theorem about Right angle Triangle. 2. Scalene, Isosceles both can be Right Angle. How to figure out if a triangle is Right Angle, That Pythagoras dude! hypotenuse^2 = adjacent^2 + opposite^2 
How do I create a fillable HTML form online that can be downloaded as a PDF? I have made a framework for problem solving and would like to give people access to an online unfilled form that can be filled out and downloaded filled out.
Create PDF Form that will be used for download and convert it to HTML Form for viewing on your website.However there’s a lot of PDF to HTML converters not many can properly convert PDF Form including form fields. If you plan to use some calculations or validations it’s even harder to find one. Try PDFix Form Converter which works fine to me. 
The perimeter of a right angled triangle is 72 cm, and the lengths of its sides are in the ratio 3:4:5. How do you work out the area?
The perimeter of a right angled triangle is 72 cm, and the lengths of its sides are in the ratio 3:4:5. How do you work out the area?Begin by working out the length of the three sides.Because the sides are in a ratio of 3:4:5 and the perimeter is 723x + 4x + 5x = 72 : combine like terms12x = 72 : isolate x by dividing both sides by 12x =6The sides are 18 cm, 24 cm and 30 cm.In a right triangle the two shorter sides are always perpendicular, so the area of any right triangle is: A = (1/2) • s₁ • s₂ where s₁ and s₂ are the two shorter sides.A = (1/2) • 18 cm • 24 cm = 216 cm² 
How do you solve a mathematical question if you are given all the sides of a triangle and you are asked to look for one angle?
You can use the cosine rule for a triangle.cos(A) = (b^2 + c^2  a^2)/2bcSimilarly for,cos(B) = (a^2 + c^2  b^2)/2accos(C) = (b^2 + a^2  c^2)/2ab 
How does one formulaically determine the precise angle to bend the four sides of a given sheet metal pyramid? I have worked this out using projection drawings and trigonometry, but wonder if anyone has one formula to solve a variety of dimensions?
I assume that you have in mind a pyramid with a square base and four identical triangular sides that rise symmetrically to a common vertex located directly above the center of the base. With apologies for the poor artwork, let [math]H[/math] and [math]W[/math] be the pyramid’s height and base width, respectively, and let [math]\theta[/math] be the angle of inclination of the sides relative to the base:Then[math]\ \cos \theta = \frac{W/2}{\sqrt{(W/2)^2 + H^2}},\ [/math]so that the angle itself is the inverse cosine of that quantity:[math]\ \theta = \arccos \left ( \frac{1}{\sqrt{1 + 4(H^2/W^2)}}\right )\ [/math](Editing to add the computation of a different angle  the one between neighboring sides)You can express the angle between neighboring sides as the angle between the normal (perpendicular) vectors to the respective sides.Consider a coordinate system in which the axes point in the following directions:1) out from the center of the base of the pyramid to the midpoint of the bottom of the first side of interest;2) vertically, from the center of the base up through the vertex;3) out from the center of the base to the midpoint of the second side of interest.A normal vector to the first side can be written as [math](H, W/2, 0)[/math], and a normal vector to the second side as [math](0, W/2, H)[/math]. If \alpha is the angle between these vectors, then:[math]\ \cos \alpha = \frac{(H, W/2, 0) \cdot (H, W/2, 0)}{(H, W/2, 0) (H, W/2, 0)},\ [/math]so that the angle between the sides is:[math]\ \alpha = \arccos \left ( \frac{1}{1 + \frac{4H^2}{W^2}} \right )\ [/math] 
Is it good practice to watch YouTube videos and Khan Academy to learn how to solve problems in engineering school, instead of figuring them out yourself?
Yes of course. The more you go through materials the more you learn. Instead of figuring the solutions yourself you can use SolutionInn  Online Tutoring  Get Study Help and Textbook Solutions for solved textbook solutions. 
How can we solve this question? A square of a side x cm has the same area as a rectangle of length (3x+5) cm and width (2x3). How can you form an equation in x? How can you show that it simplifies to 5x+x15?
How can we solve this question? A square of a side x cm has the same area as a rectangle of length (3x+5) cm and width (2x3). How can you form an equation in x? How can you show that it simplifies to 5x+x15?Q1: What is the area of a square?A1: The length of its side squaredSo, the area of the square in your question (in square centimetres) [math]= x^2[/math]Q2: What is the area of a rectangle?A2: The length of its long side multiplied by the length of its short side.So, the area of the rectangle in your question (in square centimetres) [math]= (3x + 5)(2x  3) = 6x^2 + x  15[/math]From the question, we are told that the area of the square is the same as the area of the rectangle, so:[math]x^2 = 6x^2 + x  15[/math]Subtracting [math]x^2[/math] from both sides of the equation, we have:[math]5x^2 + x  15 = 0[/math][math]\\[/math]We now need to solve this quadratic equation, i.e. find the values of [math]x[/math] such that the equation is true. To help us, there is a simple formula we can use.The solution to the general quadratic [math]ax^2 = bx + c = 0[/math] is:[math]x = \frac {b \pm \sqrt{b^2  4ac}}{2}[/math]For our equation, we have [math]a = 5[/math], [math]b = 1[/math] and [math]c = 15[/math]Slotting these values into our formula, we have:[math]x = \frac {1 \pm \sqrt{1^2  4 \ times 5 \times 15}}{2 \times 10} = \frac {1 \pm \sqrt{1 + 300}}{10}[/math][math]= \frac {1 \pm \sqrt{301}}{10}[/math]Well, its clear that we can;’t have a negative length, so the answer is:[math]x = \sqrt {3.01}  0.1 \approx 1.634935\ cm[/math]
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