Isosceles triangle

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

Correct result:

r =  375 mm

Solution:


1375 = 2•r+z
r = 3/5 • z

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

r = 375
z = 625

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