Question

1- draw a triangle which has two perpendicular sides.

Explanation:

Step1: Draw two perpendicular lines

Use a ruler to draw two lines that intersect at a right - angle ($90^{\circ}$). Let's call the intersection point $A$.

Step2: Connect the endpoints

Connect the non - intersection endpoints of the two perpendicular lines. Let the endpoints of the first line be $A$ and $B$, and the endpoints of the second line be $A$ and $C$. Connect $B$ and $C$.

The triangle $\triangle ABC$ is a right - triangle with $\angle A = 90^{\circ}$, and sides $AB$ and $AC$ are perpendicular.

Answer:

A right - triangle can be drawn as described above. For example, a triangle with vertices at $(0,0)$, $(0,3)$ and $(4,0)$ (assuming a coordinate system) where the sides along the $x$ - axis and $y$ - axis are perpendicular.