#1**+1 **

Each vertical angle corresponding to 40°,50° and 60° will be acute....so that's 6

In addition...the angle between the 50° angle and the horizontal line will have measure of 180 - 50 - 60 - 40 = 30°

And its corresponding vertical angle will also have the same measure...so...

All 8 angles formed by the 4 intersecting lines will be acute will be acute

CPhill Sep 15, 2018