In order to determine the wide of the TV, consider that the height, the wide and the diagonal of the TV can be taken as the sides of a right triangle. Then, use the Pythagorean theorem:
d² = w² + h²
where d is the diagonal length (hypotenuse), w is the wide and h is the height (the legs of the triangle).
d = 63 in
h = 43 in
w = ?
solve the equation above for w and replace teh values of the other parameters:
w² = d² - h²
w = √(d² - h²)
w = √((63 in)² - (43 in)²)
w = √(3,969 in² - 1,849 in²)
w = √(2,120 in²)
w = 46.04 in
w ≈ 46.0 in
Hence, the wide of the TV is 46.0 in