How should i estimate the measurment of an angle?

Question

we need to estimate the measurements of angles without a protractor. and i don't get it. what are some ways to do it?

Answer 1

First, learn to recognize a 90 degree angle... that's like the corner of a square.

Also learn to recognize a 180 degree angle... that's a straight line.

If you imagine taking the corner of a square (a right angle) and dividing exactly in two, that would be a 45 degree angle.

If you imagine dividing it into three, that would be a 30 degree angle.

Everything else you have to eyeball how the angle compares to 90 degrees. For example, if the angle seems to be about 2/3 the way to 90 degrees, that is 2/3 * 90 = 60 degrees.

Answer 2

Compare the angle to a 90° angle like the corner of a piece of paper. If the angle is sharper, narrower, it's less than 90° and if it's wider, it's more than 90°. Beyond that, depend on your sense of fractions: half of 90° is 45°. Halfway between 90° and a straight line, like the left side of a Y, is halfway between 90 and 180, which is 135°. And so on.

Answer 3

use some common angles as a baseline and find which angle it most closely resembles:

a straight line is 180 degrees
a L is a 90 degree angle
half of a 90 is a 45 degree angle

You should also be familiar with 30 and 60 degree angles


Now, if you are given lengths of sides on a triangle, you can use trigonometric functions (sin, cos, tan, etc.) to calculate angles without a protractor.

Best of luck!

Answer 4

in your mind - superimpose a clock on the angle
place one side of the angle where "12" would be
and then guess where the minute hand is -
allow 6 degrees per minute

e.g. 15 minutes - the 3 on the clock is
15 x 6 = 90 degrees = a right angle

best of luck

Answer 5

For very small angles, one degree is roughly 1 in 57, or, even rougher, 1 in 60. This is useful for making quick field estimates. For example, fingers held at arm's length is roughly 30 inches from the eye, so 1/2 inch, or about the thickness of one finger, at arm's length is about 1 degree.

Answer 6

A whole circle is 360 degrees, half a circle is 180 degrees, 90 degrees is 1/4 a circle, a right angle. 1/8th is 45 degrees. 1/6 of a circle is 60 degress. 1/12 of a circle is 30 degrees.

Answer 7

The mm is the focal length of the lens. DSLR digital camera are literally not rated by zoom quantity. you may have 2 lenses that are 3x zoom yet have an rather diverse field of view. as an example the 18-55mm lens is a 3x zoom fifty 5/18=3 a 100-300mm lens is likewise a 3x zoom. The 18-fifty 5 is a huge attitude to mild telephoto lens even as the 100-three hundred is a lengthy telephoto lens. At 300mm you've type of the equivalent or a touch more effective than your modern-day digital camera. To get a one lens answer which could be type of equivalent to the 12x zoom you've you ever might want to favor something like the 18-200mm lens. the issue is this lens does not be very solid in low gentle. As you reported you want to shoot exhibits. For this you want a wide aperture lens. in case you may get close the finest determination can be a 24-70mm F2.8L. value is about $a million,2 hundred. in the journey that your futher away a 70-200mm F2.8L IS $a million,seven-hundred might want to be solid. thinking you likely do not favor to spend that a lot on a lens i might want to propose the Canon 50mm F1.8 in case you may get quite close. It has no zoom yet is impressive in low gentle. value is about $100. in case you won't be able to get that close any telephoto zoom will artwork yet you've gotten to crank up your ISO as severe because that is going to flow.

Answer 8

use a goniometer..it measures angles in the medical profession...{they didnt say you couldnt, did they?}...an accurate way to determine an angle-and get one up on your teacher...

Answer 9

A²+B²/A²xB²=o