Cables extend from a to b and from a to c. the cable ac exerts a 1000 lb force f at a.

(a). what is the angle between the cable ab and ac?

(b). determine the vector component of f parallel to the cable ab.

this is answer of 144 cubic meters

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.

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°.