Degrees to radians: In geometry, both degree and radian represent the measure of an angle. One complete anticlockwise revolution can be represented by 2π (in radians) or 360° (in degrees). Therefore, degree and radian can be equated as:
2π = 360°
And
π = 180°
Hence, from the above equation, we can say, 180 degrees is equal to π radian.
Usually, in general geometry, we consider the measure of the angle in degrees (°). Radian is commonly considered while measuring the angles of trigonometric functions or periodic functions. Radians is always represented in terms of pi, where the value of pi is equal to 22/7 or 3.14.
A degree has its sub-parts also, stated as minutes and seconds. This conversion is the major part of Trigonometry applications.
Degree x π/180 = Radian
Radians × 180/π = Degrees |
How to Convert Degrees to Radians?
The value of 180° is equal to π radians. To convert any given angle from the measure of degrees to radians, the value has to be multiplied by π/180.
Where the value of π = 22/7 or 3.14
Example 1: Convert 90 degrees to radians.
Solution: Given, 90 degrees is the angle
Angle in radian = Angle in degree x (π/180)
= 90 x (π/180)
= π/2
Hence, 90 degrees is equal to π/2 in radian.
Radians to degrees Conversion
As we have already discussed, how to convert degrees to radians for any specific angle. Now, let us see, how we can convert radians to degrees for any specific angle. The formula to convert radians to degrees is given by:
Radians × (180/π) = Degrees
Example 3: Convert π/6 into degrees.
Solution: Using the formula,
π/6 × (180/π) = 180/6 = 30 degrees
Radian to Degree Equation
As we know already, one complete revolution, counterclockwise, in an XY plane, will be equal to 2π (in radians) or 360° (in degrees). Therefore, both degree and radian can form an equation, such that:
2π = 360°
Or
π = 180°
Degrees to Radian Formula
To convert degree to radian, we can use the same formula as given in the above section.
Degree x π/180 = Radian
Let us see some examples:
Example 3: Convert 15 degrees to radians.
Solution: Using the formula,
15 x π/180 = π/12
Example 4: Convert 330 degrees to radians.
Solution: Using the formula,
330 x π/180 = 11π/6
Negative Degrees to Radian
The method to convert a negative degree into radian is same as we have done for positive degrees. Multiply the given value of the angle in degrees by π/180.
Suppose, -180 degrees has to be converted into radian, then,
Radian = (π/180) x (degrees)
Radian = (π/180) x (-180°)
Angle in radian = – π
Degrees to Radians Chart
Let us create the table to convert some of the angles in degree form to radian form.
Angle in Degrees | Angle in Radians |
---|---|
0° | 0 |
30° | π/6 = 0.524 Rad |
45° | π/4 = 0.785 Rad |
60° | π/3 = 1.047 Rad |
90° | π/2 = 1.571 Rad |
120° | 2π/3 = 2.094 Rad |
150° | 5π/6 = 2.618 Rad |
180° | Π = 3.14 Rad |
210° | 7π/6 = 3.665 Rad |
240° | 3π/2 = 4.189 Rad |
360° | 2π = 6.283 Rad |
Solved Examples
Question 1: Convert 200 degrees into radians.
Solution: By the formula, we know;
Angle in radians = Angle in degree × π/180
Thus,
200 degrees in radians = 200 × π/180 = 10π/9 = 3.491 Rad
Question 2: Convert 450 degrees into radians.
Solution: By the formula, we know;
Angle in radians = Angle in degree × π/180
Thus,
450 degrees in radians = 450 × π/180 = 7.854 Rad
Frequently Asked Questions – FAQs
How do we convert degrees to radians?
What is the formula to convert radian into degrees?
2π x 180/π = 360 degrees
How to convert 30 degrees to radians?
30 x (π/180) = π/6
Hence, 30 degrees is equal to π/6 in radians
How pi radians is equal to 180 degrees?
2π = 360°
Or
π = 180°
Therefore, pi is equal to 180 degrees
What is the value of 1 degree?
What is the value of 1 radian?
Convert 3 radians to degrees.
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