Trigonometry › Lengths of circular arcs

Teacher info
A formula for arc length in terms of radius and angle
CCSS.MATH.CONTENT.HSG.C.B.5
Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.
CCSS.MATH.CONTENT.HSF.TF.A.1
Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.

LTI launch URL (help)
https://schoolyourself.org/page/lti/sy/trigonometry/arc-radian
Browse lessons