RADIANS
CLASS 9 & 10 · MATHS
What Is a Radian?
r
1 rad
STEP 1
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REMEMBER
π rad = 180°
1 radian ≈ 57.3°
Degrees → radians: × π / 180
Arc length: s = r θ
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CLASS 9 & 10 · MATHS
Why is 180° equal to π?
Radians in 25 seconds
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