Question #1c942
1 Answer
Jan 6, 2018
Explanation:
#"using "color(blue)"Pythagoras' theorem"# on the triangle on the right side
#BM=sqrt(6^2+2^2)=sqrt40=2sqrt10#
#rArrAM=2sqrt10#
#"length of string is now "2sqrt10+2sqrt10=4sqrt10#
#"extension "=4sqrt10-12~~0.649" cm to 3 dec. places"#