Arihant Expert Team Solutions for Exercise 1: Most Important Questions

The sum of interior angles of a regular polygon is ${1440}^{\mathrm{o}}$. The number of sides of the polygon is:

In the given figure, $ABCD$ is a parallelogram. $E$ and $F$ are the centroid of $∆ABD$ and $∆BCD$, respectively. $EF$ is equal to

If $o$ is the center of the circle, find the value of $x$ in the given figure.

In the figure $BC\parallel AD$. Find the value of $x$.

In the given figure, $\angle BAC$ and $\angle BDC$ are angles of same segments. $\angle DBC={30}^{\mathrm{o}}$ and $\angle BCD={110}^{\mathrm{o}}$, Find $\angle BAC$ is:

In the given figure, $\angle COE={90}^{\mathrm{o}}$. Find the value of $x.$

In triangle $ABC$, $BC\parallel DE$. $AD=2.5$ cm $DB=5$ cm, $AE=2$ cm and $BC=9$ cm. Find $EC$ and $DE$,

$O$ is the incenter of the $∆ABC$ and $\angle A={30}^{\mathrm{o}}$, then $\angle BOC$ is: