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Sol. Join OA, OB and OC. O is the centre.
ABC is an eq. .

AOC = BOC = BOA = = =1200
Total area of the design = 3(area of segment)
= 3[area of sector – area of ]

=3

=3
……..( sin² =2 sin cos )

=3

=3

=3x(70)2
=3x 4900
= 14700

=175 x 51.67 = 9042.25cm²

Mathematics 2009 Question Papers Class X
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