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ICSE Class 10 Answered

Pls answer the question on Circles Thanks.
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Asked by birpori | 04 Nov, 2018, 02:34: PM
answered-by-expert Expert Answer
Join OD
OD = OA .....radii
so in triangle AOD
angle ODA = angle OAD = x
so angle COD = 2x......exterior angle
so in triangle COD 
OD perpendicular to DC......tangent radius
angle DCB = 90-2x
 
now join BD
angle DBC is exterior angle of tri ABD
also  angle ADB = 90, angle subtended by diameter
so angle DBC = 90 + x
Answered by Arun | 06 Nov, 2018, 09:56: AM

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ICSE 10 - Maths
The length of the direct common tangent to two circles of radii 12cm and 4cm is 15cm.Calculate the distance between their centres. 
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Pls answer the question on Circles Thanks.
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Asked by birpori | 04 Nov, 2018, 02:34: PM
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