Give another name for the line of symmetry in a circle.

Draw any $\Delta \mathrm{XYZ}.$ Take a point $\mathrm{O}$ in its interior. Draw a perpendicular from $\mathrm{O}$ to $\overline{\mathrm{XY}},\overline{\mathrm{YZ}}$ and $\overline{\mathrm{XZ}}$.

For the given figure, name the following.

Two parallel chords

For the given figure, name two pairs of intersecting line segments.

For the given figure, name a diameter and its point of intersection with chord $\mathrm{AC}$.

For the given figure, name a radius.

For the given figure, name the type of quadrilateral $\mathrm{ABCD}$.

Name two right-angled triangles for the following figure.

Name two obtuse-angled triangles for the following figure.