0
How it can be proved that angle between two straight lines is equal to the angle between their normals?
Wiki User
∙ 14y ago
If two lines have angles theta1 and theta2 relative to some third arbitrary line, then the angle between those two lines is theta1 minus theta2. The normal of a line at a point is a line that is 90 degrees from the line going through that point, so the angle between a line and its normal is 90 degrees. As a result, the angle between the two normals of those lines is (theta1 plus 90) minus (theta2 plus 90), which is the same as theta1 minus theta2 because the two plus 90's cancel each other.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Why does m. in abbreviation to slope mean?
Slope is the tangent of the angle between a given straight line and the x-axis of a system of Cartesian coordinates
What is the angle between lines of force and equipotential lines in an electrical field?
The angle is a right angle.
What is the difference between phase angle and phase difference?
Although we use the term 'Phase angle' it's also an angle referred to another phasor (voltage or current).For example,conventionally when expressing power factor, we use 'voltage' as the reference. So the 'phase angle' of a particular phasor is the phase difference between our reference (voltage) & the phasor.As the gist, both mean the same except that 'phase angle' is the direction of the phasor w.r.t. positive x direction (reference)..AnswerBy definition, phase angle is the angle by which a load current leads or lags a supply voltage.Phase difference is the angle between any two electical quantities -for example, the angle two phase voltages of a three-phase system.
What is the angle between the earth's magnetic axis and geographic axis?
15
What is the difference between a theorem and postulate?
Postulates are assumed to be true and we need not prove them. They provide the starting point for the proof of a theorem. A theorem is a proposition that can be deduced from postulates. We make a series of logical arguments using these postulates to prove a theorem. For example, visualize two angles, two parallel lines and a single slanted line through the parallel lines. Angle one, on the top, above the first parallel line is an obtuse angle. Angle two below the second parallel line is acute. These two angles are called Exterior angles. They are proved and is therefore a theorem.
Is there a difference between a line and a straight angle?
yes a straight angle is a 180 degree angle and a line is just a straight line
What is the relation between a straight angle and right angle using paper folding method?
a right angle is half of a straight angle
An angle measure 180 is called?
Angles that are 180 degrees (θ = 180°) are known as straight angles. • Angles between 180 and 360 degrees (180°< θ < 360°) are called reflex angles.
An angle with a measure between 180 degrees and 360 degrees?
a straight angle
What is the difference between a zero angle and a straight angle?
A straight angle is pi radians (180 degrees) so the difference is pi radians.
Real life example of a straight angle?
The angle between the part of the street before the STOP sign and the part of the street after the STOP sign is usually a straight angle.
There are 90 degrees in a right angle how many degrees in a straight line?
There are no degrees in a straight line.The angle between two line segments that looks like a single straight line if you didn't knowwhere the vertex of the angle is, measures 180 degrees, and is called a "straight angle".
How do a obtuse angle look?
Like __/ or \__. (in between a straight line and a right angle (perpendicular lines)
Is 180 degrees a reflex angle?
No, 180 degrees is a straight angle. A reflex angle is one whose value is between 180 and 360 degrees.
What is the angle of a straight angle?
A straight angle is 180 degrees.
How does a obtuse look?
An obtuse angle is between 90o and 180o.90o is a right angle.Between 90o and 180o is an obtuse angle.180o is a straight angle.A right angle is like this (look at ray A):A^|||L-----------> exactly 90oA straight angle is this (look again at ray A):A 180o is flatFor an obtuse angle, the A should be somewhere between the places where A was in the right and the straight angles.
Why is a straight angle not considered an angle in geometry?
A straight angle is an angle.
