B) 17.1
Step-by-step explanation:
g = 5
f = 5
That means we have a 45-45-90 triangle
and the hypotenuse = times the length of a leg
Therefore, h = 5 = 7.1
5 + 5 + 7.1 = 17.1
Note: If you have not been taught about 45-45-90 triangles, then use the Phythagorean theorem. OK?