Circles Practice Question 1 | Geometry Class 10

In this video, I have solved the following question. In figure, XY and X′Y′ are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X′Y′ at B. Prove that ∠ AOB = 90°. OR In the figure, l and m are two parallel tangents to a circle with centre O, touching the circle at A and B respectively. Another tangent at C intersects the line I at D and m at E. Prove that ∠DOE = 90°. #cbse #exam #education #educational #class10 #educationalvideo #educationalcontent #maths #mathematics #exampreparation #math #mathproblems #maths #class10 #Class10Maths#cbseclass10 #Circles #TangentTheorem #TangentsToACircle #CircleTheorems #Geometry #Maths #MathsClass10 #Class10Maths #NCERTMaths #BoardExamPreparation #MathsProofs #LearnGeometry #MathsConcepts #ExamOriented #education #icse #grade10 #cirlce