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CBSE Class 9 Answered

qus 1 - show me by fig. how a circle divides the plane, on which it lies in three parts.
 
 
 
qus2- prove that if the bisector of any angle of a triangle and the perpendicular bisector of its opposite side intersect, they will intersect n the circumcircle of the triangle. 
                             plzzzzzzz........ give me the sol of this ques with concept of main topic of this ques
 
 
qus 3 - if O is the centre of a circle of a circle of radius r and AB is a chord of the circle at a distance r/2 from O, then find angle BAO.
 
 
qus 4 - Let C be the mid point of arc AB of a circle such that m arc AB = 183 degree. if the region bounded by the arc ACB and line segment AB is denoted by S, then where centre O of the circle lies?
 
qus 5 -If A and B are two points on acircle such that m( arc AB) = 260 degree. find A possible value for the angle subtended by an arc BA at a point on the circle.
 
qus 6 - if AB is a chord of a circle , P and Q are the two pints on the circle different from A and B, then prove that  angle APB+ angle AQB = 180 degree or angle APB= angle AOB.
 
qus 7 -If ABC is arc of acircle and angle ABC = 135 degree, then prove that the ratio of arc ABC to the circumference is 1:4.
 
Asked by Varsha | 24 Jan, 2015, 08:40: PM
answered-by-expert Expert Answer
 
Q u e s t i o n space 3 : U sin g space p y t h a g o r a s space t h e o r e m comma space t h i r d space s i d e space o f space t h e space t r i a n g l e equals square root of r squared minus r squared over 4 end root equals fraction numerator r square root of 3 over denominator 2 end fraction A l l space t h e space s i d e s space o f space t h e space t r i a n g l e space a r e space i n space t h e space r a t i o space o f space 1 : 1 half : fraction numerator square root of 3 over denominator 2 end fraction. T h u s space t h e space a n g l e s space o f space t h e space t r i a n g l e space a r e space 30 degree comma space 60 degree comma space 90 degree. space left square bracket u sin g space 30 degree minus 60 degree minus 90 degree space t h e o r e m right square bracket A n g l e space o p p o s i t e space t o space s i d e space 1 half space i s space 30 degree. T h u s space angle B A O equals 30 degree P l e a s e space p o s t space e a c h space q u e s t i o n space s e p a r a t e l y.
Answered by Prasenjit Paul | 26 Jan, 2015, 02:47: AM

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