Maharashtra Board Solutions for Chapter: Circle, Exercise 3: Practice set 3.3

In the figure, points $\mathrm{G},\mathrm{D},\mathrm{E},\mathrm{F}$ are concyclic points of a circle with centre $C$. $\angle \mathrm{ECF}=70°,\mathrm{m}(arcDGF)=200°$ find $\mathrm{m}(arcDE)$ and $\mathrm{m}(arcDEF)$.

In figure $∆QRS$ is an equilateral triangle. Prove that, $arcRS\cong arc\mathrm{QS}\cong arc\mathrm{QR}$

In figure $∆QRS$ is an equilateral triangle. Prove that, $\mathrm{m}(arc\mathrm{QRS})=240°$

In figure chord $AB\cong$ chord $\mathrm{CD}$
Prove that, $arc\mathrm{AC}\cong arc\mathrm{BD}$