please answer this question i need to practise it
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Step-by-step explanation:
in triangle oDb
od=10cm
ob=20cm(radius of circle)
therefore, bd=√ob^2-od^2(Pythagoras theorem)
bd=√400-100
=√300
bd=10√3 cm. or 10×1.73=17.3cm
similarly , dc =10√3 or 17.3cm
therefore, bc=bd+dc
=10√3+10√3
=√3(10+10)
20√3cm or. 17.3+17.3 =34.6cm
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