# Isosceles triangle

In an isosceles triangle, the arm's length and the length of the base are in ratio 3 to 5. What is the length of the arm?

r =  375 mm

### Step-by-step explanation:

1375 = 2•r+z
r = 3/5 • z

2r+z = 1375
5r-3z = 0

r = 375
z = 625

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