Geometry: An Interactive Journey to Mastery

8. Prove: AB + BC + CD + DA !ͼ௘AC௘ͽ
   ͼ௘6HHFigure 15.6௘ͽ


9. Given: mT‘‘!P 786
   Prove: UH!HS TS.
   ͼ௘6HHFigure 15.7௘ͽ


10. A triangle has sides of length x, x + 2, and 10.
    Find the range of values of x for which all three of the following statements are simultaneously true.
    D௘ͽ 7KLVWULDQJOHH[LVWV
    E௘ͽ LVWKHORQJHVWVLGHRIWKHWULDQJOH
    F௘ͽ 7KHWULDQJOHLVDFXWH

A

B

C

D Figure 15.6

Figure 15.7

T

U

S

H