Answer: The width of the screen is 13.5 inches
Step-by-step explanation: The diagonal has been given as 15.6 inches while the height has been given as 7.8 inches.
Note that the diagonal is the length across the screen, which is equivalent to an hypotenuse. with the hypotenuse given as well as one of the other two sides, we can solve for the unknown side by using the Pythagoras theorem which states that;
AC² = AB² + BC²
Where AC is the hypotenuse and AB and BC are the other two sides.
Substituting for the known values we now have
15.6² = 7.8² + BC²
243.36 = 60.84 + BC²
Subtract 60.84 from both sides of the equation
182.52 = BC²
Add the square root sign to both sides of the equation
√182.52 = √BC²
13.5099 = BC
Therefore the width of the screen is approximately 13.5 inches
