Look at the image used by the author of "Heads Up on Sports Safety.” An old photo of men playing football without pads or helmets. Look at the image used by the author of "Heads Up on Sports Safety.” The author most likely included this image from an outside resource to show how stadiums have changed. photographic technology has changed. football uniforms have changed. football strategies have changed.

h= 12 inches

step-by-step explanation:

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°.

(1,-1) i hope this

step-by-step explanation: