7. Every week, a technician in a lab needs to test the
scales in the lab to make sure that they are accurate.
She uses a standard mass that is exactly 4 g and gets
the following results.
a. Which scale gives the most precise measurement?
4059 scale 1 3.989 scale 2 4.02 scale 3

b. Which scale gives the most accurate measurement?

Select the correct answer. given: ∆abc with prove: statement reason 1. given 2. ∠cab ≅ ∠edb ∠acb ≅ ∠deb if two parallel lines are cut by a transversal, the corresponding angles are congruent. 3. ∆abc ~ ∆dbe aa criterion for similarity 4. corresponding sides of similar triangles are proportional. 5. ab = ad + db cb = ce + eb segment addition 6. substitution property of equality 7. division 8. subtraction property of equality what is the missing statement in the proof? scroll down to see the entire proof.