West Bengal Board Solutions for Chapter: Revision of Previous Knowledge, Exercise 15: Let's workout

Draw a line segment $\overline{PQ}$ of length $9 \mathrm{cm}$. Let us bisect the line segment $\overline{PQ}$ with the help of compass and measure each part.

Draw a line segment of length $12 \mathrm{cm}$ with a scale and measure its parts and verify.

Draw an angle $72°$ with a protector. Bisect the angle with a compass Measure its each part with a protector to verify if the angle has been bisected.

On the line segment $\overline{AB}$, draw a perpendicular $BC$ at the point $B$ with a compass. Bisect the $\angle ABC$ with a compass.

Draw a perpendicular from an external point $P$ on the line segment $\overline{MN}$ or $\overline{MN}$ produced.

Draw a triangle $ABC$ with scale and pencil. Now, with the help of compass, let us bisect each of the three angles of the triangle and find if the angle bisectors are concurrent.

With the help of protractor draw two angles $80°$ and $100°$ respectively. Now with the help of compass construct two more angles equal to $80°$ and $100°$. Write the types of angles so drawn.

Draw a triangle $ABC$ with scale and pencil. Bisect the three sides with compass. Find the side bisectors are concurrent.