What is a terhedron?

Is it possible to make an angle smaller by making the arms shorter In geometry? The surface area of a balloon which depends on the amount of air inside is 2 square meters? What is the area of a obtuse triangle? What is the opposite sides of a parallelogram are both parallel? What angle is vertical to 43 degrees? Is a rhombus a parallelogram and why? How are two line that are parallel to each other different from any other two lines? How much is wt of 1m3 of sand? The angle that measures 115 degrees is it scalene or isosceles? What is the diameter of a circle with a circumference of 38 inches? Does the Pythagoream Theorem Work on all triangles? Who developed the FORCAST formula? What is a parallelogram in which all sides are congruent? What is the radius if a semi-circle has a perimeter of 25.71cm? If you have an area of 24 square feet how could you find the side length of the plywood square? Is a circle a parallelogram? Has one straight side and one curved side? How many facets does the fire mark diamond have? Is bueno a type of affordable designer purse line? What is the letter used to refer to the characteristics shape of the logistic growth curve?