Question

give me the answer of question no . 2 nd

Answer 1

As you see the distance of chord from circle to be 3cm and the radius to be 7cm, You might have noticed a right angled triangle with perpendicular 3cm(distance from center) and hypotenuse 7(radius) Using Pythagoras Theorem,
H
${7}^{2} - {3}^{2} = {x}^{2} \\ x = \sqrt{49 - 9 } \\ x = \sqrt{40 } \\ x = 2 \sqrt{10}$
You find half the chord to be x and multiplying by 2 you find the length of AB.
AB=
$4 \sqrt{10}$