NCERT Class 9
20. In Fig. 10.16, ∠OAB = 30º and ∠OCB = 57º. Find ∠BOC and ∠AOC.
02
Jul
20. In Fig. 10.16, ∠OAB = 30º and ∠OCB = 57º. Find ∠BOC and ∠AOC. ∠OAB = 30º and ∠OCB = 57º. Find ∠BOC and ∠AOC. 20. In Fig. 10.16 July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class 9 ,
19. In Fig.10.15, AOB is a diameter of the circle and C, D, E are any three points on the semi-circle. Find the value of ∠ACD + ∠BED.
02
Jul
19. In Fig.10.15, AOB is a diameter of the circle and C, D, E are any three points on the semi-circle. Find the value of ∠ACD + ∠BED. 19. In Fig.10.15 AOB is a diameter of the circle and C D E are any three points on the semi-circle. Find the value of ∠ACD + [...]
18. Two circles with centres O and O′ intersect at two points A and B. A line PQ is drawn parallel to OO′ through A(or B) intersecting the circles at P and Q. Prove that PQ = 2 OO′.
02
Jul
18. Two circles with centres O and O′ intersect at two points A and B. A line PQ is drawn parallel to OO′ through A(or B) intersecting the circles at P and Q. Prove that PQ = 2 OO′. 18. Two circles with centres O and O′ intersect at two points A and B. A [...]
17. A quadrilateral ABCD is inscribed in a circle such that AB is a diameter and ∠ADC = 130º. Find ∠BAC.
02
Jul
17. A quadrilateral ABCD is inscribed in a circle such that AB is a diameter and ∠ADC = 130º. Find ∠BAC. 17. A quadrilateral ABCD is inscribed in a circle such that AB is a diameter and ∠ADC = 130º. Find ∠BAC. July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class [...]
16. In Fig.10.14, ∠ACB = 40º. Find ∠OAB.
02
Jul
16. In Fig.10.14, ∠ACB = 40º. Find ∠OAB. ∠ACB = 40º. Find ∠OAB. 16. In Fig.10.14 July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class 9 ,
15. In Fig.10.13, ∠ADC = 130° and chord BC = chord BE. Find ∠CBE.
02
Jul
15. In Fig.10.13, ∠ADC = 130° and chord BC = chord BE. Find ∠CBE. ∠ADC = 130° and chord BC = chord BE. Find ∠CBE. 15. In Fig.10.13 July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class 9 ,
14. A chord of a circle is equal to its radius. Find the angle subtended by this chord at a point in major segment.
02
Jul
14. A chord of a circle is equal to its radius. Find the angle subtended by this chord at a point in major segment. 14. A chord of a circle is equal to its radius. Find the angle subtended by this chord at a point in major segment. July 2, 2021 Category: Chapter 10 - [...]
13. The circumcentre of the triangle ABC is O. Prove that ∠OBC + ∠BAC = 90º.
02
Jul
13. The circumcentre of the triangle ABC is O. Prove that ∠OBC + ∠BAC = 90º. 13. The circumcentre of the triangle ABC is O. Prove that ∠OBC + ∠BAC = 90º. July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class 9 ,
12. If a pair of opposite sides of a cyclic quadrilateral are equal, prove that its diagonals are also equal.
02
Jul
12. If a pair of opposite sides of a cyclic quadrilateral are equal, prove that its diagonals are also equal. 12. If a pair of opposite sides of a cyclic quadrilateral are equal prove that its diagonals are also equal. July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class 9 ,
11. If a line is drawn parallel to the base of an isosceles triangle to intersect its equal sides, prove that the quadrilateral so formed is cyclic.
02
Jul
11. If a line is drawn parallel to the base of an isosceles triangle to intersect its equal sides, prove that the quadrilateral so formed is cyclic. 11. If a line is drawn parallel to the base of an isosceles triangle to intersect its equal sides prove that the quadrilateral so formed is cyclic. July [...]