If the circumference of a circle is changed from 9 cm to 3 cm, then the diameter decreases by a factor of 3.
You can solve this by using "similar triangles".
In triangle ABC, we are looking for side AC which is x. Side AC is similar to side DF in triangle EDF.
You can solve for side x by picking two sides in triangle ABC and their corresponding sides in triangle EDF. This is what I mean:

Substitute for the values of AC, BC, DF and EF:


To solve for y, do the same thing. Pick two sides on triangle ABC and their corresponding sides in triangle DEF.

Substitute for the values and solve:


We have the value x to be 5.5 units and y to be 6 units.
Answer:
SAS Postulate
Step-by-step explanation:
The contributors to the proof are listed in the left column. They consist of a congruent Side, a congruent Angle, and a congruent Side. The SAS Postulate is an appropriate choice.
2. Definition of linear pair
3. Linear pair theorem
4. Definition of supplementary angles
5. m<1 + m<2 + m<3 = 180
6. Substitution property of equality
7. m<1 + m<2 + m<4
7. Subtraction property of equality
Answer:
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