JAMB - Mathematics (2001 - No. 23)
The chord ST of a circle is equal to the radius, r, of the circle. Find the length of arc ST.
πr/6
πr/2
πr/12
πr/3
説明
Since ST = the radius r, => SOT is equilateral.
Each angle = 60°
Length of arc ST = θ/360 x 2πr
= 60/360 x 2 x π x r = πr/3
Each angle = 60°
Length of arc ST = θ/360 x 2πr
= 60/360 x 2 x π x r = πr/3