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3. In each of the following, find the equation of circle with centre (-a, -b) and radius $space space space space square root of straight a squared minus straight b squared end root$ .

Centre (h, k) $left right arrow$ (-a, -b) $rightwards double arrow$ h = -a, k = -b
Diameter of circle = $2 square root of straight a squared minus straight b squared end root space space rightwards double arrow space Radius comma space straight r space equals space square root of straight a squared minus straight b squared end root$
∴ Equation of circle is : $<pre>uncaught exception: mkdir(): Permission denied (errno: 2) in /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php at line #56mkdir(): Permission denied in file: /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php line 56 #0 [internal function]: _hx_error_handler(2, 'mkdir(): Permis...', '/home/config_ad...', 56, Array) #1 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php(56): mkdir('/home/config_ad...', 493) #2 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/FolderTreeStorageAndCache.class.php(110): com_wiris_util_sys_Store->mkdirs() #3 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(231): com_wiris_plugin_impl_FolderTreeStorageAndCache->codeDigest('mml=<math xmlns...') #4 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/TextServiceImpl.class.php(59): com_wiris_plugin_impl_RenderImpl->computeDigest(NULL, Array) #5 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/service.php(19): com_wiris_plugin_impl_TextServiceImpl->service('mathml2accessib...', Array) #6 {main}</pre>$
or $left parenthesis straight x plus straight a right parenthesis squared plus left parenthesis straight y plus straight b right parenthesis squared equals left parenthesis square root of straight a squared minus straight b squared end root right parenthesis squared$
$rightwards double arrow$ $left parenthesis straight x plus straight a right parenthesis squared plus left parenthesis straight y plus straight b right parenthesis squared space equals space straight a squared minus straight b squared space rightwards double arrow space straight x squared plus straight y squared plus 2 ax plus 2 by plus straight a squared plus straight b squared equals straight a squared minus straight b squared$
Hence, the equation of circle is: $straight x squared plus straight y squared plus 2 ax plus 2 by plus 2 straight b squared equals 0$

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4. Find the equation of a circle with centre at (2, 2) and passes through the point (4,5).

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Long Answer Type

5. Find the equation of a circle which pass through the points O (0, 0), A (4, 0) and B (0, 3).

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6. Find the equation of the circle passes through (0, 0) and making intercepts a and b on the co-ordinate axes.

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Short Answer Type

7. Find the equation of a circle whose centre is (3, –2) and has an area of 154 square units.

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8. Find the equation of a circle having radius 5 units and the centre as the point of intersection of the straight lines 2x – y – 5 = 0 and 3x + 2y = 4.

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9. Find the equation of a circle, two of whose diameters are along the straight lines x – 2y = 7 and x + 2y + 1 = 0 and which passes through the point (1, 4).

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