Triangle ABC is dilated using the rule (x,y)--(1/2x, 1/2y) to create Triangle A’B’C’. The measure of angle C is 42 degrees. What is the new measure of Angle C'?

Select one:

a.
50 degrees

b.
21 degrees

c.
42 degrees

d.
84 degrees

Question

Triangle ABC is dilated using the rule (x,y)-->(1/2x, 1/2y) to create Triangle A’B’C’.  The measure of angle C is 42 degrees.  What is the new measure of Angle C'?

Select one:

a.
50 degrees

b.
21 degrees

c.
42 degrees

d.
84 degrees

jimthompson5910 · Answer

Dilations preserve the angle measures. In other words, the angles won't change. The size changes (it gets bigger or smaller) but the shape doesn't change.

notGenna · Answer

so basically if it stays the same the answer would be C ?

jimthompson5910 · Answer

Correct. The answer is 42 degrees.