O P Malhotra, S K Gupta and, Anubhuti Gangal Solutions for Chapter: Triangles, Exercise 5: Revision Exercise

The side opposite to right angle is called perpendicular.

The measure of each angle of an equilateral triangle is $60°.$

Sum of the angles of a triangle is more than $90°.$

If $\mathrm{A}\mathrm{B}=6 \mathrm{c}\mathrm{m}, \mathrm{B}\mathrm{C}=8 \mathrm{c}\mathrm{m}$ and $\mathrm{A}\mathrm{C}=10 \mathrm{c}\mathrm{m}$, then the triangle is right-angled at $\mathrm{A}$.

In the adjoining figure, If $\mathrm{\angle }\mathrm{ACD}=\mathrm{k}°$ then find the value of $\mathrm{k}$.

In the adjoining figure, If $\mathrm{\angle }\mathrm{BAD}=\mathrm{k}°$, then find the value of $\mathrm{k}$.

In the given figure, If $x=k°$ then find the value of $k$..

To find the distance from point $\mathrm{A}$ to $\mathrm{B}$ on the opposite end of a lake, a surveyor constructed a figure as shown. If $\mathrm{}\mathrm{A}$  is $\mathrm{k} \mathrm{km}$ from $\mathrm{B}$, then find the value of $\mathrm{k}$.