West Bengal Board Solutions for Chapter: Drawing of Different Geometrical Figures, Exercise 1: Let's work out-22.1

At $3 O\text{'}$ clock the arms of the clock will be at _____$°$.

The straight lamp post on the road is _____$°$ to the ground.

Draw a triangle $ABC$ with the help of scale and pencil. From three vertices $A, B$ and $C$ of the triangle, perpendicular $AP, BQ$ and $CR$ are drawn on the sides $BC, AC$ and $AB$ respectively. Let's see from the figure, if the line segment $AP, BQ$ and $CR$ are concurrent i.e, they intersect at a point.

With the help of set square draw a right-angled triangle $ABC$ such that $\angle ABC=90°$. From the point $B$, draw a perpendicular on the hypotenuse $AC$. Also find, if the perpendiculars from $A, B$ and $C$, on the opposite side, meet at a point. If so, name the point.

At a fixed point on a straight line _____ perpendicular can be drawn.

Fill in the blanks with correct option:

From a fixed point outside a straight line _____ perpendicular can be drawn.

Draw a line segment $AB$, take any point $P$ and $Q$ on the line segment. Draw two perpendiculars $PM$ and $QN$ at $P$ and $Q$ on the line segment $AB$. Find if line segments $PM$ and $QN$ are parallel or intersecting.

Draw a line segment of length $4 cm$, taking this length as radius a circle is drawn. The centre of the circle is named $O$. A chord $AB$ which is not a diameter is drawn. From $O$, a perpendicular $OM$ is drawn on the chord $AB$. Measure the line segment $AM$ and $BM$ with a scale and write the conclusion derived.