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Gyrometer
A right angle joint is called a vertex as is with any other angle (yes even straight angles)
The three parts are faces, vertices and edges. The faces are the flat surfaces, the edges are the lines that joint the corners which are called vertices.
Angles and their geometrical applications from A to Z are as follows:- 1 Acute angles are greater than 0 but less than 90 degrees 2 Base angles of an isosceles triangle are equal 3 Circumference of a circle has 360 degrees 4 Degrees, minutes and seconds are measurements of angles 5 Exterior angles of polygons add up to 360 degrees 6 F as a letter has corresponding equal angles 7 Greater the angle then greater the turn or rotation 8 Hexagon has 6 angles that add up to 720 degrees 9 Isosceles triangle has 3 interior angles adding to 180 degrees 10 Joint angles of 95 and 85 degrees are supplementary or 180 degrees 11 Kite has 4 interior angles which add up to 360 degrees 12 L as a letter has a right angle which means 90 degrees 13 Minute is 1/60 of a degree 14 Nonagon has 9 inner angles that total 1260 degrees 15 Obtuse angle is greater than 90 but less than 180 degrees 16 Perpendicular lines intercept at right angles 17 Quadrilaterals have 4 inside angles with a sum of 360 degrees 18 Reflex angles are greater than 180 but less than 360 degrees 19 Second is 1/60 of a minute 20 Triangles all have 3 interior angles that add up to 180 degrees 21 Undecagon has 11 sides with inner angles of 1620 degrees 22 Vertical opposite angles are equal 23 West has a bearing of 270 degrees from north 24 X as a letter creates vertical opposite equal angles 25 Y axis forms 90 degrees with the X axis on the Cartesian plane 26 Z as a letter has equal alternate angles
these muscle groups either extend a joint, extensors) or contract the joint (flexors). triceps extend the elbow joint, biceps bend the elbow joint.