Follow these instructions to unclog your air conditionerâs drain line. 1  Step 1: Get out your wet/dry vacuum. 2  Step 2: Find the main drain line outside of your home. 3  Step 3: Connect the wet/dry vacuum hose to the main drain line.  Step 4: Check the vacuum for algae water and other debris.
The base angles theorem states that if the sides of a triangle are congruent (Isosceles triangle)then the angles opposite these sides are congruent.
By the base angles theorem every equilateral triangle is also equiangular. By the triangle angle sum theorem the three angles add to 180Â°. By the substitution and division properties each of the angles are 60Â°. By the definition of an obtuse angle, none of the angles in an equilateral triangle are obtuse. QED.