What is the measure of angle oac if major arc ab measures 220 degrees? 55° 70° 110° 140° i already know the answer is 55 but i need to know why and how to get 55?

The triangle shown has a hypotenuse with a length of 13 feet. the measure of angle a is 20 degrees. and the measure of angle b is 70 degrees. which of the following is closest to the length, in feet, of line segment ac? no need to use a calculator to find the trig numbers. each function is listed below. 4.4 5 12.2 35.7