Isometric analysis is dealing with measurements in Plumbing involving various items such as pipe fitting (using fittings and calculating the take offs or calculations for the various ones such as 90's, 45's, Tees, Tee Wyes, etc.) as well as grade or the slope at which gravity sewer is ran. Its basically a fancy term for the geometry, algebra, or trig formulas (overall mathematics used in the plumbing trade. Or at least that is what I have gathered. I am currently studying for the test in MS right now and I have researched this question myself.
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Circles appear in isometric drawings as an elipse.
An isometric thumbnail sketch is a drawing based on the isometric axis. It is commonly used in engineering. It is also known as a two-point sketch.
They are lines that are equal in distance. The word comes from Greek and means 'having equal measurement'. A line is also isometric if it connects isometric points.
Isotonic contraction results in shortening of the muscle, leading to movement. In Isometric contraction, as the name implies, there is no change in length of the muscle. Thus, it can't lead to any movement. However, Isometric contraction adds or removes power from a movement, thus facilitating or retarding it. This, facilitation and retardation itself gives us a feeling of movement, for example walking, even in the total absence of actual movement i.e. walking. This feeling of movement induced by isometric contraction is known as Isometric movement. We use isometric movements in thinking and dreaming.