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The radius is 10 cm
the angle subtended is 90 degrees 
therefore the chord length is Square root of 10 square+10 square
=10 root 2
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thanks pls answer my other questions too
A chord of circle of radius 10 cm subtends a right angle at the centre.Find the area of the corresponding minor segment and hence find the area of the major sector? ... Let r be the radius of the circle and θ be the angle subtended by the chord at the centre.... Area of the minor segment 
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