Find the measure of angle c and can you explain

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

Write the sentence as an equation. b increased by 281 is d

Atriangular bandana has an area of 46 square inches. the height of the triangle is 5 3 4 inches. enter and solve an equation to find the length of the base of the triangle. use b to represent the length of the base.