What is the exact value of cos 240?
What is the exact value of cos 240?
Important Angle Summary
| θ° | θradians | cos(θ) |
|---|---|---|
| 240° | 4π/3 | -1/2 |
| 270° | 3π/2 | 0 |
| 300° | 5π/3 | 1/2 |
| 315° | 7π/4 | √2/2 |
What is the value of cos 75?
We don’t know the value of cos75° directly. But we can write 75° as the sum of 45° and 30° and use equation (1) to simplify the expression. Hence, the value of cos75° is 14(√6−√2).
How do you calculate cos 240?
- 60∘ is an angle of one of the standard triangles with. cos(60∘)=12.
- 240∘ is in the 3rd quadrant so (either by CAST or noting that the “x-side” of the associate triangle is negative) cos(240∘)=−cos(60∘)
- cos(240∘)=−12.
What is the exact value of cos 300?
1/2
How do you find the exact value of cos 60?
Since the value of cos 60 degree in fraction is Cos 60 = ½, The cos 60 value in the decimal form is 0.5. Cos 60 = 0.5.
Are right angles 90 degrees?
Right angles measure 90 degrees. Obtuse angles measure more than 90 degrees.
Why should you never argue with a 90 degree angle?
It’s always right. Because it is an inanimate object and cannot present proper support for its arguments. You should’ve said “acute”.
Why is right angle 90 degrees?
In geometry and trigonometry, a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn. The term is a calque of Latin angulus rectus; here rectus means “upright”, referring to the vertical perpendicular to a horizontal base line.
Is a corner always 90 degrees?
Almost all corners stay at 90 degrees.
What angle is 60 degree?
A 60 degrees angle is an acute angle because it is less than 90 degrees.
What angle is straight?
180 degrees
Can an angle be 0 degrees?
A zero angle (0°) is an angle formed when both the angle’s arms are at the same position. An acute angle is an angle that is more than 0° but less than 90°. Common examples of acute angles include: 15°, 30°, 45°, 60°, etc.
Does a straight angle have a vertex?
They are all potential vertices. So in your angle, the vertex is N. But, since a straight angle is essentially a line, you can just pick 2 points to be on the rays and any point in-between these 2 points to represent a vertex (but there can only be one vertex for each angle you create).
Does a line have vertices?
Vertices of Line Segments and Angles In geometry, if two line segments intersect, the point where the two lines meet is called a vertex. This is true, regardless if the lines cross or meet at a corner. Because of this, angles also have vertices.
Are straight angles supplementary?
Two Angles are Supplementary when they add up to 180 degrees. Notice that together they make a straight angle. But the angles don’t have to be together.
What is whole angle?
A whole angle is an angle which measures exactly 360o.