Question

Ram drew a line segment $AB$ of length $3cm$ and another line segment $CB$ of length $4cm$, which is perpendicular to line segment $AB$. What is the length of the third side of the triangle?

• A. 5 cm
• B. 6 cm
• C. 2 cm
• D. 1 cm​

Answer 1

The correct option is A

5 cm

The triangle is a right angled triangle as $CB$ is perpendicular to $AB$ .So, the third side can be easily calculated by using Pythagoras theorem.

Let the length of the third side be $zcm$.

$z^2=3^2+4^2$

$z=\sqrt{25}$

$z=5\text{cm}$