Question
The length of a tangent from a point A at a distance 5
cms. from the centre of the circle is 4 cms. Radius of the circle isSolution
A tangent at any point of a circle is perpendicular to the radius through the point of contact. Therefore, ∠OTA = 90° and ΔOTA is a right-angled triangle. By Pythagoras theorem, OA2 = OT2 + AT2 52 = OT2 + 42 OT2 = 25 - 16 OT2 = 9 OT = ± 3 Radius OT cannot be negative. Hence, the radius is 3 cm.
148, ‘?’ , 15 4 , 17 8 , 23 8 , 35 8 , 56 8
3601 3602 1803 604 154 36
...8, 7, 12, 35, 128, 635
14, 28, 54, 98, 154, 224
104Â Â Â Â Â 136Â Â Â Â Â 152Â Â Â Â 160Â Â Â Â Â 164Â Â Â Â Â ?
...A’ is the nth term of the given series and ‘B’ is the (n + 1)th term of the given
series. Choose the correct statement from the following s...
7    7       14    42   ?     840
...11Â Â Â 12.1Â Â Â Â 14.3Â Â Â Â 17.6Â Â Â Â Â 22Â Â Â Â Â ?
9Â Â Â 4.5Â Â Â 4.5Â Â Â 9Â Â Â 36Â Â Â ?
40 30 20 ? 7.5 4.375
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