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aastha jain

· started a discussion

· 1 Months ago

did not understand the solution (Question: 188669.0 )

how is 2x+2y=180?

Question:
The tangents are drawn at the extremities  of a diameter AB of a circle with centre P. If a tangent to the circle at the point C intersects the other two tangets at points points Q and R, then the measure of the \(\angle \)QPR is – 
Options:
A) 45º
B) 60º
C) 90º
D) 180º
Solution:
Ans: (c)


Subhajit Ghosh

· commented

· 1 Months ago

For any convex quadrilateral sum of internal angles will always be 360; Now angle PAQ and PBR both are of 90 degrees, hence the remaining two angles which is 2xx and 2y must be equal to 360 - 180 = 180. Hope you got the point.

Monica

· commented

· 1 Months ago

the two tangents are equal.... so the two are adjacent angles having sum 180

manish raj

· commented

· 1 Months ago

ABQR is a quadrilateral
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