sud21 Master | Next Rank: 500 Posts View User Profile Posts: 344 Joined: Sat Nov 12, 2011 3:21 am Thanked: 1 times Followed by:2 members geometry by sud21 » Thu Jan 12, 2012 4:47 am The sides of a triangle is a, b, and c. Are the three angles all less than 90 measure degrees? 1). The areas of the semi-circles with the radius a, b, c are 4, 5, 6, respectively. 2). c<a+b<c+2 Top Quote