How do i find the perimeter of any shape?

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

In the diagram below,abc is congruent to dec what is the value of x

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cot of 61.6