Construct the point B' on the circle c so that the size of an angle BAB' is 76°.
Use tool [icon]/images/ggb/toolbar/mode_anglefixed.png[/icon]for construction an angle with given size. To measure arc length use circular arc [icon]/images/ggb/toolbar/mode_circlearc3.png[/icon].
The length of an arc of a circle with radius 3 cm if the arc subtends a central angle of 72° is
Let [i]r[/i] is radius of the circle and a is central angle. Write the formula for arc length [i]BB'[/i].
[i]|BB'| = r.a [/i](size of an angle a must be in radians)