Compare it to 1/2 (which is the same as 6/12)
Idk your best bet is to look it up online thats what i do often
B=8. A^2+B^2=C^2. This means 6to the second power plus B to the second power equals10 to the second power. 36+b^2=100. B to the second power equals 64. Square root of 64 is 8, so B equals 8
Pretty sure its 36 (not sure) i keep getting 36.6 cm
