give me answer of question number 1, 2 and 3
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1.are of tri.BCD= 25/2=12.5 cm^2
2. draw perpendicular to Chord. it will bisects the chord.
Now, distance of chord from centre
= root under 13^2 -5^2
=root under 144
= 12 cm
3.side of eq.triangle= 60/3=20cm
area= root 3/4 side^2
= root 3/ 4 × 400
= root 3×100
= 100root3 cm^2
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