No such thing.
It is a typo. A 45 mm pistol would fire a bullet larger than a Golf ball. I think you are looking for a .45 CALIBER pistol. That is a handgun that fires a bullet about 45/100ths of an inch in diameter. Perhaps the two best known are the 45 Colt Peacemaker type revolver of cowboy fame, and the 1911A1 .45 Automatic Pistol, used by the US Army.
45mm.
45mm = 4.5cm
The specific dimensions required for a 35mm x 45mm passport photo are 35mm in width and 45mm in height.
45mm * 45mm * 3.14 = 6358.5 sq. mm
45mm x 55mm is approx 1.77in x 2.17in 25.4mm = 1in ⇒ 45mm = 45 ÷ 25.4 in ≈ 1.77in ⇒ 55mm = 55 ÷ 25.4 in ≈ 2.17in
45mm
4cm
45mm= 4.5 cm45mm = 0.045mThese are simple numbers, but if you have larger numbers go to google and use convert units site.
A 35mm x 45mm photo is equivalent to 3.5cm x 4.5cm. To convert millimeters to centimeters, you divide by 10, so 35mm becomes 3.5cm and 45mm becomes 4.5cm.
45mm
yes
1.77165 inches