GWD 03-27

[schung0529]

Q27:
R, S, T, and U are points on a line, and U is the midpoint of line segment ST. If the lengths of line segments RS, RT, and ST are 20, 4, and 24, respectively. What is the length of line segment RU?

A. 6
B. 8
C. 12
D. 14
E. 16


The answer is B...請好心人幫幫我吧~

[waleaaa]

這題如果先畫出U,S,T三點會先卡住～
我是先利用RS, RT, 及ST的距離畫出R,S,T三點～
因為很巧的RS及RT的距離和剛好等於ST　所以知道R在S及T兩點之間
標出三點間的距離後　在找出U的位置　應該就可得知RU=8了...