EM-1721

Angle at centre and circumference

E Math · Secondary 4 · Medium · Angle at centre and circumference

A circle has centre O. AB is a diameter and C is a point on the circle such that angle AOB is 180°. The angle at the centre subtended by arc AC is 70°. What is angle ABC?

Answer to the nearest degree.

$35^\circ$
$20^\circ$
$55^\circ$
$70^\circ$

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