Question
If radii of two concentric circles are 4 cm and 5 cm,
then the length of eachchord of one circle which is tangent to the other circle isSolution
We have two concentric circles with radii 4 cm and 5 cm. A chord of the larger circle is tangent to the smaller circle. We need to find its length. Identify Key Distances The radius of the larger circle = 5 cm The radius of the smaller circle = 4 cm (this is also the perpendicular distance from the center to the chord). The perpendicular from the center bisects the chord. Use Pythagoras Theorem In the right triangle formed: 
Hence Full Chord Length = AB=2×MB=2×3=6 cm
What approximate value should replace the question mark?
12.45% of 640.20 − 60% of 2500 = ? − 9000.10
`[(7.99)^2 - (13.001)^2 + (4.01)^3]^2=` ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
What value should come in place of question mark (?) in the following question. (You need not to calcualte the exact value)
?/647 = 226/ ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
A, B & C have Rs.1550 together. If they divide the money in the ratio 1:3:1 respectively. Find the difference of amount received by B and C.
What approximate value should come in the place of (?) in the following questions?
∛(92.8 + √1025) * ? = 16.06% of 750
√1024.21 × √624.89 ÷ 4.98 + 11.99 × 4.01 = ?
√784 × 3 + (713.99 ÷ 6.98) = ?% of 619.99
11.11% of (123.45 + 234.56) + 10.01³ - (5.05 of 7.07) = ? of (88.88 - 33.33)
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