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Help with 2D distance

Noob alert. I have a part that vaguely looks like my drawing below. I'm trying to measure the 2D distance between lines 1 and 3. I measured the lines with plane 3 as my projection plane. When I try to dimension the distance between the two lines on the CAD model, it comes up as 1.054. It should be 154. I don't understand what I'm doing wrong. The only way it will give me close to 154 is if I select 3D distance, but that's technically not right. Please forgive my "noobiness" and my comically simple drawing. Any ideas?

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