This document outlines several key facts about angles and triangles: Fact A states that angles around a point add up to 360 degrees. Fact B and C say that angles on a straight line and in a triangle respectively add up to 180 degrees. Fact D notes that the base angles of an isosceles triangle are equal. Fact E gives the angle measure of an equilateral triangle as 60 degrees. Facts F through H cover properties of equal, alternate, corresponding, and allied angles.