In the figure, angle a measures 45° and angle e measures 15°.

the measurement of angle c is
°.

the measurement of angle d is
°.

∠C = 45°   ∠D = 30°

Step-by-step explanation:

Given in the figure attached.

∠A = 45° and ∠E = 15°

We have to find the measures of ∠C and ∠D.

(A) Since ∠A + ∠B + ∠C = 180°

                45° + 90° + ∠C = 180°

               135 + ∠C = 180°

                        ∠C = 180 - 135 = 45°

(B) Now ∠C + ∠F = 180° ( supplementary angles )

             45 + ∠F = 180

                      ∠F = 180 - 45

                             = 135°

Since ∠D +∠E + ∠F = 180°

          ∠D + 15 + 135 = 180

                 ∠D + 150 = 180

                           ∠D = 180 - 150

                                 = 30°

Therefore, ∠C = 45°

                  ∠D = 30°

but which class are u may know that first

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet