Question

$A$ is the point on the y-axis whose ordinate is $5$ and $B$ is the point $(-3,1)$. Calculate the length of $AB$.

• A. $2.5cm$
• B. $5cm$
• C. $15cm$
• D. $0.5cm$

Answer 1

The correct option is B $5cm$

Distance formula: The distance between points $(x_1,y_1)$ and $(x_2,y_2)$ is given by $\sqrt{{(x_2-x_1)}^2+{(y_2-y_1)}^2}$

Since, A is a point on $y-axis$ =>abesicca=$0$ and ordinate is $5$=> $A(0,5)$ & $B(-3,1)$

$AB=\sqrt{(3{)}^2+{\left(4\right)}^2}AB=5cm$