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ZhangYan
Ingrid is making a quilt using squares that measure 5 in. on a side. What is the length of a diagonal of one of the quilt squares? Round to the nearest tenth. 8.7 in. 7.1 in. 3.5 in. 14.2 in.
have you done Pythagoras' theorem?
ok so we know that the quilt is being made using squares... which measure 5in on each side... basically one square will look like this |dw:1336502631039:dw| do you agree?
ok good, after drawing a diagonal, we'll have this |dw:1336502741454:dw| we'll have two right angled triangles... right?
ok good, according to pythagoras, if we have a right angled triangle, this formula holds \(\huge a^2=b^2+c^2 \) |dw:1336503014472:dw| my "C" is little but u can see it :) are we okay so far?
ok good, we are going to apply this to the question. we know that each side of the square is 5in, hence, |dw:1336503197307:dw| now looking at this, we know what "b" and "c" are, they're both 5, so we have to solve for "a" ....
what is a? |dw:1336503379725:dw|
thanks for your help this informations is really helps to me :)