Question

Scotty is making a train of dominoes on the floor.10 Dominoes8 DominoesHow many dominoes are needed to complete thetriangle?6121836

Answer 1

a The given triangle is right-angle triangle.

So, we can use the Pythagoras formula,

$H^2=P^2+B^2\ldots(1)$

Here,

$\begin{gathered} H=10 \\ B=8 \end{gathered}$

Then from equation (1)

$\begin{gathered} H^2=P^2+B^2 \\ (10)^2=P^2+(8)^2 \\ P^2=100-64 \\ P^2=36 \\ P=\sqrt[]{36} \\ P=6 \end{gathered}$

So, the required number of dominoes is 6.

Hence, the correct option is option A.