Smartphone vs Tennis ball: size comparison
Smartphone: 14.7 cm. Tennis ball: 6.7 cm. Both silhouettes are drawn at the same scale.
Size ratio: ×2.2
Smartphone
14.7 cm
What is measured Height of a smartphone with a 6.1-inch screen
Screen size is measured diagonally: 6.1 inches is about 15.5 cm.
Source : Wikipedia — Smartphone
Tennis ball
6.7 cm
What is measured Diameter of a regulation tennis ball
Rules require a diameter between 6.54 and 6.86 cm.
Source : Wikipedia — Tennis ball