Question

Help please? X.X

Bill designs a table with a glass top. What is the length of the side AB of the glass top?

Answer 1

i dont know what to do:( an explanation would be nice so i know how to do it next time :O

Answer 2

angle A and angle D are the same, i think.
so you can calculate the angle of D using a right angled triangle of base 4.5 and hyp of 5
then plug that angle into a right angle triangle up the top with hyp of 20 angle A=D and calculate the base, then multiply by 2 to get the full length of AB