What is a tetrarangle?

Find out value of sin 45? What is FTR stands for on a floor plan? What is the past tense of trim? Does a wave cap or du-rag work better for 360 hair waves? Why was cartesian coordinate system invented? What is a tangent ratio? How convert date in to tithi? How is the area of a trapezium calculated? Application of trignometry in real life? What was the problem with Pythagoras' theory? What is a tetredron? An angle that measures 90 degree? What does mon petit trianon mean? How many cycles of a 40 MHz sine wave occur in 0.2ms? A pilot takes off at a point A and ascends at a fixed angle with the level runway if he flies a distamce of 2500 yards but covers only a ground distance of 2200 yards then what is his amgle of ascent? How do you find sin cos and tan values manually? What does ST FTRM2 mean? An angle that has a measure of 180 degree? What is the exact value of cos 120? When you are building weight in a haircut the hair should be held at what elevation?