What is a tetredron?

Is the difference between the height of two people measured from the shoulder or the top of the head? Why is the tail used in the welding symbol? What is the length of a hat? What is Contribution of trigonometry to maths? The triad built on the fifth step of the scale is called? Why does an object thrown at 45 degrees travel the farthest? What is the submediant of C major? What is higher an Angel or a Goddess? How do you know whether to use sin or cosine? Formula to find the mass of a cube? How do you use a tri square safe? What is the value of x and y of the vectors below a 45 m-W b 20 m -60 deg SW c 76 m -35 deg NW d 43 m -58 deg SE e 35 m -40 deg NE Thanks xx? How do you integrate cos squared theta times sine theta? Determine the amplitude of y equals -2 sin x? Is at 3'oclock an adverb? What is Bermuda Triangle in Marathi? Find the explicit formula for the sequence? What is the effect of to long arc in welding? How close to trap should vent be on a water closet? When can take the 1.4142 formula to 45 degree?