Final answer:
Statement c) ZCBD = ZDBE must be true.
Step-by-step explanation:
To understand which statement must be true given ABC - ZDBE, we need to analyze the given expression and the options:
- a) ZABC - ZABD: This option takes the segments ZABC and ZABD as subtracted quantities. It does not align with the given expression ABC - ZDBE.
- b) ZABD = ZCBE: This option equates the segments ZABD and ZCBE, which are not present in the given expression ABC - ZDBE.
- c) ZCBD = ZDBE: This option equates the segments ZCBD and ZDBE, which align with the given expression ABC - ZDBE. Therefore, this statement must be true.
- d) CBD = ZABC: This option equates the segments CBD and ZABC, which are not present in the given expression ABC - ZDBE.
From the analysis, we can conclude that statement c) ZCBD = ZDBE must be true.