Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
I can give you a start: Since the angle at T is 100, the four angles of the parallelogram are 100, 80, 100, 80 The line HS bisects one of the 80 angels, so its angle of THS is 40. So now we know all the angles except the one you want. The shape HSAT has four angles and I believe these should add up to 360.
