Me! aec = a. 72.5 b. 107.5 c. 63.5 d.116.5 the measures of angle ead and ecd = a.72.5 b.58.25 c.90 abc = a. 72.5 b. 90 c. 121.75 d.58.25 adc = a. 107.5 b.116.5 c. 58.25 d. 63.5

Step-by-step explanation:

Nice summary problem.

<AEC

<EAD and <ECD

Both of these are tangents to a circle. Tangents meet radii at 90 degree angles.

<EAD = <ECD = 90 degrees

<ABC

<ABC is 1/2 the central angle. The Central angle is <AEC

<ADC

There are 2 ways of doing this. You should know both of them.

One

All quadrilaterals = 360 degrees. You know three of the angles. You should be able to find ADC

Method Two

<ADC = 1/2 (major Arc - Minor Arc)  This formula is fundamental to circle / tangent properties. The Major arc is the larger of the two parts of the circumference of a circle. The Minor arc is the smaller.

b) the dogs need to shift their focus to human scent.

both equations and proportions are better.