In geometric studies, angles are defined every bit the effect of rotation from the initial side to the final side. In addition, the direction of rotation has pregnant inward angles. An angle marked "positive" if the direction of rotation is contrary to the clockwise rotation direction together with marked "negative" if the direction of rotation is clockwise. The direction of rotation to cast an angle tin likewise hold out observed at the terminate side position against the starting side. To move inward easy, let's await at the next description:
In the plain of Cartesian coordinates, if the initial side of a work coincides alongside the x-axis together with the final side lies inward i of the quadrants inward the cartesian coordinate, it is called the measure angle. If the terminate side is on i axis of the coordinate, this angle is called quadrant limiting, ie 0°, 90°, 180°, 720°, together with 360°.
Note that inward lodge to limited an angle, it is usually used inward Greek letters such every bit α (alpha), β (betha), γ (gamma), together with θ (tetha), together with working capital alphabetic quality letters such as A, B, C, together with D.
Pay attending to the icon below:
If the resulting angle is α (standard angle), together with then the angle β is called the coterminal angle, hence that α + β - 360°, every bit illustrated every bit follows:
1. Standard angle together with coterminal angle
2. The angle on each quadrant
Definition:
The coterminal angle is the measure 2 angles, having the coinciding ends.
Example:
Draw the measure corner angle from lx ° together with decide the position of each corner on the Cartesian coordinate!
Answer:
The starting side lies on the x-axis together with the terminate side of OA is located inward quadrant I.
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Sorry if in that place is a incorrect word.
The terminate of give-and-take wassalamualaikum wr. wb
Referensi :
- Book of math senior high schoolhouse degree 10 Semester 2