Use your university library’s Springer subscription. Download the chapters you need. Alternatively, admit that Evans & Gariepy or Maggi are better teaching tools, and keep Federer on your shelf as the ultimate reference—the book you consult once a year to cite a single theorem, only to marvel at the genius and density of a bygone era of mathematics.
Do not click any "Download Federer PDF Free" links you find on Reddit or Twitter/X. They are either viruses, incomplete scans, or bait. Do it the academic way. Your research integrity (and your hard drive) will thank you. federer geometric measure theory pdf
Happy rectifying.