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Widescreen is all wider than 1.333∞ (equals 4:3).
1.333∞ (equals 4:3) is the Standard Definition standard width since the 20th century A.D.
1.777∞ (equals 16:9) is the High Definition/Ultra High Definition standard width since the 21st century A.D.
In the case of the image on the right side:
• 16 units wide and 12 units tall (equals 4:3) with the bars.
• 16 units wide and 9 units tall (equals 16:9) without the bars .