Answer

Yes — if you are using the Jain conversion 1 dhanush = 4 haath = about 6 feet, then 1.75 dhanushas = about 10.5 feet. ( encyclopediaofjainism.com)

Explanation

Jain texts describe Mahavira’s height in ancient traditional units, not modern metric units. In the Aupapātika description, Mahavira’s height is given as seven cubits. Because these are old measurement systems, the exact feet conversion is only approximate. ( jainqq.org)

Takeaway

So your estimate is basically right: 1.75 dhanushas is about 10.5 feet, not just 10 feet. ( encyclopediaofjainism.com)