Once you know this number, you can calculate the degrees of your acute angle. Use your calculator to determine the degrees of the angle. Type the value for slope into your scientific calculator, then press the inverse tan button tan This will give you the degrees of the angle. Method 2. Extend the bottom ray of the angle in a straight line.
Mark your vertex with a dot, then use the long side of your ruler to draw a straight line to the left of the vertex. The bottom ray of the angle should be a single long line that extends below the open top ray of the angle. If it is angled up or down, it will ruin the accuracy of your equation. Draw a vertical line connecting the top ray and the line. Line up the short end of your ruler with the bottom ray at a point where the long side crosses the top ray. Follow the long side to draw a line straight up from the bottom ray that connects the two.
Measure the length of the bottom line from the vertex. Place your ruler below the bottom line, with the beginning at the vertical line creating the right angle. Measure the length from that point of intersection to the vertex of the original angle. Measure the length of the vertical line.
Line up the short end of your ruler with the bottom line of the small acute triangle. Read up the ruler to the point where the vertical line meets the open ray of your obtuse angle. This is the length of your vertical line. Find the slope of the acute angle. Divide the rise value by the run value to determine the slope of the acute angle.
You'll use this value to calculate the degrees of the acute angle. Calculate the degrees of the acute angle. Enter your slope value in your scientific calculator, then press the inverse tan button tan The value displayed is the number of degrees in the acute angle. Subtract the degrees of the acute angle from A flat line is a straight angle with degrees.
Since you drew a straight line, the sum of the acute angle you calculated and the obtuse angle will be degrees. Subtracting the degrees of the acute angle from will give you the degrees of your obtuse angle. Method 3. Identify the smaller acute angle associated with the reflex angle.
A reflex angle has more than degrees but fewer than This means that if you look at the reflex angle, you'll also see an acute angle inside the rays of the reflex angle. No matter how well you try to be prepared, sometimes the unexpected occurs and you do not have the right tools at hand to do a job.
Architects, engineers and carpenters frequently must measure angles, as for example the angle formed by the ground and a wooden railing on a flight of stairs. A protractor is the usual tool for the job. When a protractor is not available, however, an ordinary ruler and a calculator will suffice. Hold one of the lines so that it is level with the ground. If this line is the ground, all the easier. This line will be called the base. The line running up at an angle from the base, will be called the hypotenuse.
Measure the length of the line from the top of the hypotenuse straight down to the base. This line will be referred to as the leg. This is a transparent online protractor, also helps you measure angles in a picture, you can easily measure the angle of any object around you, taking a picture and uploading it, then dragging the midpoint of the protractor to the vertex of the angle.
Every time I want to measure the angle, I always can't find the protractor. Fortunately, here is an online protractor that is convenient and practical. Now, we can use laptops, computers, tablets or smart phones to measure the angle of anything, around us anytime, anywhere. A protractor is used for measuring angles. There is a small hole in the center of the protractor. It may also guide a set square to draw vertical or diagonal lines. Its name comes from its resemblance to the letter T.
Higher-end table saws are often equipped with T-square fences. These set squares come in two usual forms, both right triangles: one with degree angles, the other with degree angles. Typically the blade and the stock will be rectangular in profile, though on some wooden squares the ends of the blade and the stock might be cut to a decorative shape. Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Can you use a ruler as a protractor?
Ben Davis May 31, Can you use a ruler as a protractor? How do you make a homemade protractor? Can I print a protractor? How do you draw an angle without a protractor?
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