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Find the length of the chord of a circle where the radius is 7 cm and perpendicular distance is 6 cm.
Draw a perpendicular from the centre of the circle to the chord. It bisects the chord into two equal parts. Applying the Baudhāyana–Pythagoras Theorem to the right triangle, the half-chord is obtained as √13 cm. Doubling this value gives the full chord length. Therefore, the required chord length isRead more
Draw a perpendicular from the centre of the circle to the chord. It bisects the chord into two equal parts. Applying the Baudhāyana–Pythagoras Theorem to the right triangle, the half-chord is obtained as √13 cm. Doubling this value gives the full chord length. Therefore, the required chord length is 2√13 cm.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 5 I’m Up and Down and Round and Round (2026-27):
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See lessExplain why the following statement is true: If the perpendicular distance of a chord from the centre is d and the radius is r, then the chord length is 2√(r2-d2 ).
A perpendicular drawn from the centre to a chord always bisects the chord into two equal parts. Each half forms a right triangle with the radius as the hypotenuse and the perpendicular distance as one side. By applying the Baudhāyana–Pythagoras Theorem, the half-chord equals √(r² − d²). Therefore, tRead more
A perpendicular drawn from the centre to a chord always bisects the chord into two equal parts. Each half forms a right triangle with the radius as the hypotenuse and the perpendicular distance as one side. By applying the Baudhāyana–Pythagoras Theorem, the half-chord equals √(r² − d²). Therefore, the complete chord length is 2√(r² − d²).
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 5 I’m Up and Down and Round and Round (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-5/
See lessConsider Fig. 5.15. If CE is perpendicular to AB, CH is perpendicular to GH, and CE = CH, show that AB = GF.
Since CE and CH are perpendicular distances from the centre to the chords and CE = CH, both chords are at the same distance from the centre. According to Theorem 7, chords that are equidistant from the centre of the same circle are equal in length. Hence, the two chords are equal. Therefore, AB = GFRead more
Since CE and CH are perpendicular distances from the centre to the chords and CE = CH, both chords are at the same distance from the centre. According to Theorem 7, chords that are equidistant from the centre of the same circle are equal in length. Hence, the two chords are equal. Therefore, AB = GF.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 5 I’m Up and Down and Round and Round (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-5/
See lessUse the Baudhāyana–Pythagoras theorem to show why Theorem 6 must be true.
Consider two equal chords in the same circle. Draw perpendiculars from the centre to each chord. Since the radii are equal and half of each equal chord is also equal, the Baudhāyana–Pythagoras Theorem shows that the perpendicular distances from the centre must be equal. Therefore, equal chords are aRead more
Consider two equal chords in the same circle. Draw perpendiculars from the centre to each chord. Since the radii are equal and half of each equal chord is also equal, the Baudhāyana–Pythagoras Theorem shows that the perpendicular distances from the centre must be equal. Therefore, equal chords are always equidistant from the centre of the circle.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 5 I’m Up and Down and Round and Round (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-5/
See lessDistinguish between the troposphere and stratosphere.
The troposphere is the lowest layer, extending up to about 12 km, where temperature decreases with increasing altitude, and it contains most of the water vapour, clouds, and all weather phenomena like rainfall, fog, and hail. The stratosphere lies above it, extending up to about 50 km; it is free ofRead more
The troposphere is the lowest layer, extending up to about 12 km, where temperature decreases with increasing altitude, and it contains most of the water vapour, clouds, and all weather phenomena like rainfall, fog, and hail. The stratosphere lies above it, extending up to about 50 km; it is free of clouds and weather disturbances, making it ideal for flying aeroplanes, and it contains the ozone layer, which filters out the Sun’s harmful ultraviolet radiation. The two layers are separated by a transition zone called the tropopause.
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