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In a circle with centre O, AD is a diame...

In a circle with centre O, AD is a diameter and AC is a chord. Point B on AC such that OB = 7cm and `angle OBA = 60^@`. If `angle DOC = 60^@`, then what is the length of BC?
केंद्र वाले एक वृत्त में, AD एक व्यास है और AC एक जीवा है। AC पर एक बिंदु B इस प्रकार है की OB = 7 सेमी और `angle OBA = 60^@` | यदि `angle DOC = 60^@` है, तो BC की लंबाई क्या है?

A

7 cm

B

`3 sqrt 7` cm

C

3.5 cm

D

`5 sqrt 7` cm

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In a circle with centre O, AD is a diameter and AC is a chord. B is a point on AC, such that OB = 5 cm and angle OBA= 60^@ . If angle DOC= 60^@ , then what is the length of BC? केंद्र O वाले एक वृत्त में, AD व्यास है तथा AC जीवा है | B, AC पर स्थित बिंदु है जो इस प्रकार है कि OB =5 सेमी तथा angle OBA= 60^@ है | यदि angle DOC= 60^@ है, तो BC की लंबाई ज्ञात करें |

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In a circle with centre O, AB is the diameter and CD is a chord such that ABCD is a trapezium. If angle BAC= 40^@ ., then angle CAD is equal to: केंद्र O वाले एक वृत्त में, AB व्यास है और CD एक ऐसी जीवा है कि ABCD समलम्ब है | यदि angle BAC= 40^@ है, तो angle CAD ज्ञात करें|

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PINNACLE-GEOMETRY-EXERCISE
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