का स्प-रखा है, का लम्बाई ज्ञ

1.	का स्प-रखा है, का लम्बाई ज्ञात कजए ।Two concentric circles of radii a and b (a > b) are given. Find the length ofthe chord of the larger circle which touches the smaller circle.
Answer» Angle OEC=90(tangent and radius at point of contact are perpendicular) by Pythagoras theoremOC^2=OE^2+CE^2a^2=b^2+CE^2√(a^2-b^2)=CECD=2CE[perpendicular drawn from centre bisect the chord]CD=2√(a^2-b^2)

का स्प-रखा है, का लम्बाई ज्ञात कजए ।Two concentric circles of radii a and b (a > b) are given. Find the length ofthe chord of the larger circle which touches the smaller circle.

Answer»

Angle OEC=90(tangent and radius at point of contact are perpendicular)

by Pythagoras theoremOC^2=OE^2+CE^2a^2=b^2+CE^2√(a^2-b^2)=CECD=2CE[perpendicular drawn from centre bisect the chord]CD=2√(a^2-b^2)