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A chord of a circle of radius 10cm su...

A chord of a circle of radius 10cm subtends a right angle at the centre. The length of the chord (in cm) is `5sqrt(2)` (b) `10sqrt(2)` (c) `5/(sqrt(2))` (d) `10sqrt(3)`

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We know that only one plane can pass through three non-collinear points.
And if a line intersects a plane that doesn't contain the line, then the intersection is exactly one point. If two different planes intersect, then their intersection is a line.
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