First of all it's probably not a 26 cm wheel, byt rather a 26 inch wheel.
That size is a bit tricky if you have to go looking for spare parts as there are no less than 4 different sizes called 26".
Better to use the millimeter size instead, which for most 26" today is 559 mm.
Secondly, wheel size doesn't tell all about bike size - frame size is every bit, if not more important. At your height, a frame that can take 26" wheels have every chance of being both too big and too small.
I'll add a few links, which I strongly recommend that you check out, but the short answer would be that for a Mountainbike-typ of bicycle, you should probably be looking at a size medium (17-18") bike.
What is 3.14 pie 26cm
26
2 cm = 0.8 in
20cm-26cm
10.23 inches
1 metre 26cm
26 centimeters is 0.26 meters.
26cm
The diagonal is 26cm
26 centimeters is equivalent to approximately 10.24 inches.
20,800 cm3
It depends in what toothpaste box you have but they are usually about 10 in (26cm)