EM-270

Tangent perpendicular to radius

E Math · Secondary 3 · Medium · Tangent perpendicular to radius

A circle has centre O. A tangent touches the circle at T. The line TO is extended beyond O to a point A, so T, O and A lie on a straight line. The tangent makes an angle of

90^\circ

with OT. What angle does the tangent make with the line OA?

$90^\circ$
$180^\circ$
$0^\circ$
$45^\circ$

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