A regular pentagon is created using the bases of five congruent isosceles triangles, joined at a common vertex. The total number of degrees in the center is 360°. If all five vertex angles meeting at the center are congruent, what is the measure of a base angle of one of the triangles? 54° 72° 108° 144°

B.

Step-by-step explanation:

An isosceles triangle has two equal sides and angles (called base angles).

From the question, the common vertex of 5 congruent isosceles triangles are joined. Thus, creating a regular pentagon which has five sides.

Given that the five congruent triangles form a total of 360° at the center, then;

the measure of a base angle of one of the triangles =

                                                     =

answer: i guess 105 degrees?

step-by-step explanation:

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify