JAMB - Mathematics (2008 - No. 26)
Find the angle subtended at the center of a circle by a chord which is equal in length to the radius of the circle.
30o
45o
60o
90o
คำอธิบาย
If a length of a chord is equal to the length of a radius in the same circle, the triangle formed y the chord and the radii is an equilateral triangle
∴each angle = 60o
∴each angle = 60o