Class 9 Maths

Tyagi Parsad

Asked: April 19, 2024In: Class 9 Maths

What was chosen as the standard reference for measuring atomic masses in 1961?

The carbon-12 isotope was chosen as the standard reference for measuring atomic masses.

chirag345

Asked: November 25, 2023In: Class 9 Maths

ABCD is a quadrilateral in which P, Q, R and S are mid-points of the sides AB, BC, CD and DA. AC is a diagonal. Show that :

(i) SR||AC and SR = 1/2 AC (ii) PQ = SR (iii) PQRS is a parallelogram. NCERT Solutions for Class 9 Maths Chapter 8 QUADRILATERALS Exercise 8.2 Question 1. NCERT Questions Exercises 9th Maths Chapter 8 QUADRILATERALS NCERT Academic Session 2023-2024

bittu45

Asked: November 24, 2023In: Class 9 Maths

Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see Fig. 9.27). Prove that ∠ACP =∠QCD.

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.3 Question 9. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: Two intersecting circles create points where their circumferences meet. ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

In Fig.9.26, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠ BEC = 130°and ∠ ECD = 20°. Find ∠ BAC.

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.3 Question 5. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: Intersecting lines within a circle involve chords, secants, and ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

In Fig.9.25, ∠ABC = 69°, ∠ACB = 31°, find ∠ BDC.

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.3 Question 4. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: Angles within a circle take diverse forms. Central angles, ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

In Fig.9.24, ∠PQR = 100°, where P,Q and R are points on a circle with centre O. Find ∠ OPR

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.3 Question 3. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: In a circle, various angles emerge, such as central ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

In Fig. 9.23, A,B and C are three points on a circle with centre O such that ∠ BOC = 30° and ∠ AOB = 60°. If D is a point on the circle other than the arc ABC, find ∠ADC.

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.3 Question 1. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: An arc in a circle is a curved section ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

If a line intersects two concentric circles (circles with the same centre) with centre O at A, B, C and D, prove that AB = CD (see Fig. 9.12)

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.2 Question 4. NCERT Question Exercises 9.2 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: Concentric circles share a common center and differ ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

Prove that if chords of congruent circles subtend equal angles at their centres, then the chords are equal.

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.1 Question 2. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: – A central angle is formed by extending the endpoints ...

bittu45

Asked: November 24, 2023In: Class 9 Maths

Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at their centres.

NCERT Solutions for Class 9 Maths Chapter 9 Circles Exercise 9.1 Question 1. NCERT Questions Exercises 9th Maths Chapter 9 Circles NCERT Academic Session 2023-2024 CBSE Board and Others state Board Description: A chord of a circle is a straight ...

Category: Class 9 Maths

What was chosen as the standard reference for measuring atomic masses in 1961?

ABCD is a quadrilateral in which P, Q, R and S are mid-points of the sides AB, BC, CD and DA. AC is a diagonal. Show that :

Two circles intersect at two points B and C. Through B, two line segments ABD and PBQ are drawn to intersect the circles at A, D and P, Q respectively (see Fig. 9.27). Prove that ∠ACP =∠QCD.

In Fig.9.26, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠ BEC = 130°and ∠ ECD = 20°. Find ∠ BAC.

In Fig.9.25, ∠ABC = 69°, ∠ACB = 31°, find ∠ BDC.

In Fig.9.24, ∠PQR = 100°, where P,Q and R are points on a circle with centre O. Find ∠ OPR

In Fig. 9.23, A,B and C are three points on a circle with centre O such that ∠ BOC = 30° and ∠ AOB = 60°. If D is a point on the circle other than the arc ABC, find ∠ADC.

If a line intersects two concentric circles (circles with the same centre) with centre O at A, B, C and D, prove that AB = CD (see Fig. 9.12)

Prove that if chords of congruent circles subtend equal angles at their centres, then the chords are equal.

Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at their centres.

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