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length of arc formula gcse. There are 360 degrees in any circle. You may be asked to find the sector angle given either an arc length or sector area.
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Sector Area Angle Fraction x p r². Length of arc AB 518 2 pr 518 2 p 18 10 p. You may be asked to find the sector angle given either an arc length or sector area.
Sector Area Angle Fraction x p r².
If the area is 361 p this means p r 2 361 and that the radius is 19. You will understand Arc Length and Sector Area by looking at free maths videos and example questions. Learn what Arc Length and Sector Area are and how to cacluate Arc Length and Sector Area of Circles. Thus the length of the arc AB will be 518 of the circumference of the circle which equals 2 pr according to the formula for circumference.
