Write 2+11+20+29 in sigma notation

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.