Circular Measure
Arc of length
\(l_{AB} = r \:.\: \theta\)
\(\theta\) in radians
Area of sector
\(A_{AOB} = \dfrac 12 \:.\: r^2 \:.\: \theta\)
\(\theta\) in radians
Exercise
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Arc of length
\(l_{AB} = r \:.\: \theta\)
\(\theta\) in radians
Area of sector
\(A_{AOB} = \dfrac 12 \:.\: r^2 \:.\: \theta\)
\(\theta\) in radians