Answer:
arc ABC ≈ 18.2 cm
Explanation:
the length of the arc ABC is calculated as
arc = circumference of circle × fraction of circle
the angle around the centre O is 360° , then
angle subtended by arc = 360° - 100° = 260°
then
arc = 2πr ×
( t is the radius = 4 )
= 2π × 4 ×
= 8π ×
=
≈ 18.2 cm (to 3 significant figures )