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A and B are two points on a circle with ...

A and B are two points on a circle with centre O. AT is a tangent, such that `angle BAT = 45^@`.N is a point on OA, such that BN= 10 cm. The length of the median OM of the `triangle NOB` is:
A और B केंद्र O वाले एक वृत्त पर स्थित दो बिंदु हैं | AT एक स्पर्श रेखा है जो इस प्रकार है कि `angle BAT = 45^@` है| N, OA पर स्थित एक बिंदु है जो इस प्रकार है कि BN =10 सेमी है |`triangle NOB` की मध्यिका OM की लंबाई ज्ञात करें |

A

a)`10 sqrt2 cm`

B

b)`5 sqrt2 cm`

C

c)`5 sqrt3` cm

D

d)5 cm

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