That is the simplest form.
Recall that the sum of all interior angles in a triangle is 180°, and that a flat-line is always 180°.
Check the picture below.
For z=2⇒ 2y+2=12
2y=12-2
2y=10
y=10:2
y=5
x - y+z=6
x - 5 + 2=6
x -3 =6
x=6+3
x=9
You divide the numerator by the denominator. Which gets .66
Answer: 3cm
Explanation:
We can use Pythagorean’s theorem to find that other side:
a^2 + b^2 = c^2
a^2 + 4^2 = 5^2
a^2 = 25 - 16
a^2 = 9
a = 3
Therefore, the other side is 3cm