Question : The area of a circle is $324\pi$ square cm. The length of its longest chord (in cm) is:
Option 1: 36
Option 2: 28
Option 3: 38
Option 4: 32
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Correct Answer: 36
Solution : Given: Area of circle = $324\pi$ sq. cm Let the radius of the circle be $r$ cm. ⇒ $\pi r^2= 324\pi$ ⇒ $r^2= 324$ ⇒ $r=18$ We know that the longest chord of the circle is the diameter. So, the longest chord = 2 × 18 = 36 cm Hence, the correct answer is 36.
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Question : The area of the sector of a circle of radius 12 cm is $32 \pi \;\mathrm{cm}^2$. Find the length of the corresponding arc of the sector.
Option 1: $\frac{16}{3} \pi$ cm
Option 2: $\frac{13}{3} \pi$ cm
Option 3: $\frac{10}{3} \pi$ cm
Option 4: $\frac{8}{3} \pi$ cm
Question : The area of a rhombus is 256 square cm, and one of its diagonals is twice the other in length. The length of its larger diagonal is:
Option 1: 32 cm
Option 2: 16 cm
Option 3: 48 cm
Option 4: 24 cm
Question : The radius of a circle is 5 cm. The length of chord AB in this circle is 6 cm. What is the distance of this chord from the centre of the circle?
Option 1: 4 cm
Option 2: 5 cm
Option 3: 6 cm
Option 4: 8 cm
Question : A chord of length 40 cm is drawn in a circle having a diameter of 50 cm. What is the a minimum distance of another parallel chord of length 30 cm in the same circle from a 40 cm long chord?
Option 1: 10 cm
Option 2: 15 cm
Option 3: 5 cm
Option 4: 20 cm
Question : The length of the chord of a circle is 24 cm, and the perpendicular distance between the centre and the chord is 5 cm. The radius of the circle is:
Option 2: 13 cm
Option 3: 12 cm
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