Open half-line is the same thing as ray.

Two lines may intersect in two points.

Two lines are parallel only when they have no point in common.

In the given figure, $L and M$ are midpoints of $AB\hspace{0.17em}and BC$ respectively. If $AB\mathit{=}BC$, prove that $AL\mathit{=}MC$.

In the given figure, $L\mathit{ }and\mathit{ }M$ are midpoints of $AB\mathit{ }and\mathit{ }BC$ respectively. If $BL=BM$, prove that $AB=BC$.

In ancient India, the shapes of altars used for household rituals were

The number of interwoven isosceles triangles in Sriyantra is

In Indus Valley Civilization (about $\mathrm{BC} 3000$), the bricks used for construction work were having dimensions in the ratio of