Question

СРОЧНО!!!!!!!!!!!!!!!!!!

Answer 1

BD²=x²-3²

BD²=(28-x)²-7²

x²-3²=(28-x)²-7²

x²-9=784-56x+x²-49

56x=744

x=93/7

BD²=(93/7)²-3²=(8649/49)-9=(8649-49·9)/49

BD=√(8208)/7=(4√513)/7