14. The value of all goods and services produced in the United States in a year is about 1.6 x 1013 US dollars, while the value of all goods and services produced in the United Kingdom in a year is about 2.4 x 1012 US dollars. How many times the value of the goods and services produced in the United Kingdom is the value of the goods and services produced in the United States? A. less than 6 times

B. between 6 and 10 times

C. between 10 and 60 times

D. more than 60 times

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.