REVIEW EXERCISES

Can you form a right triangle with an obtuse angle?

The exterior angles of a $∆ABC$, having vertex at $C$ is equal to the sum of which two angles?

Can an isosceles triangle be right-angled?(Write Yes/No)

If one angle of a triangle is $90°$ and the other two angles are in the ratio $1:2$, find the angles.

In the adjacent figure, find $\angle ABD+\angle DBC+\angle BCD+\angle CDB+\angle BDA+\angle DAB$ in degrees.

In the given figure, find the values of $x$ and $y$

In the given figure, find the values of $x$ and $y$.

A ladder reaches a window which is $12 \mathrm{m}$ above the ground on one side of the street. keeping its foot at the same point, the ladder is turned to the other side of the street to reach a window $5 \mathrm{m}$ high. Find the width (in $\mathrm{m}$) of the street if the length of the ladder is $13 \mathrm{m}$