Let A(-2, 1), B (2, 4) and C (4, 2) be the three vertices of a triangle. Let us consider the following example to have better understanding of reflection. Here the rule we have applied is (x, y) -> (y, -x). Let us look at some examples to understand how 90 degree clockwise rotation can be done on a figure.Once students understand the rules which they have to apply for rotation transformation, they can easily make rotation transformation of a figure.įor example, if we are going to make rotation transformation of the point (5, 3) about 90 ° (clock wise rotation), after transformation, the point would be (3, -5). Rule : When we rotate a figure of 90 degrees clockwise, each point of the given figure has to be changed from (x, y) to (y, -x) and graph the rotated figure. ![]() What is the rule for a 90 degree clockwise rotation? In other words, switch x and y and make y negative. When rotating a point 90 degrees counterclockwise about the origin our point A(x,y) becomes A'(-y,x). What is the rule for a 90 counterclockwise rotation? The new position of point M (h, k) will become M' (k, -h). Rotation of point through 90° about the origin in clockwise direction when point M (h, k) is rotated about the origin O through 90° in clockwise direction. This produces a gentle updraft, which forces warm air near the ceiling down into the occupied space. In the winter, reverse the motor and operate the ceiling fan at low speed in the clockwise direction. Using the Ceiling Fan Year Round The airflow produced creates a wind-chill effect, making you "feel" cooler. Typical nuts, screws, bolts, bottle caps, and jar lids are tightened (moved away from the observer) clockwise and loosened (moved towards the observer) counterclockwise in accordance with the right-hand rule.ĭoes ceiling fans use a lot of electricity?ĭo Fans Use a Lot of Electricity? Running a fan takes a lot less electricity than running an air conditioner ceiling fans average at about 15-90 watts of energy used, and tower fans use about 100 watts. Starting from the top, a hand moving clockwise would move to the right-hand side. Is clockwise to the right? Clockwise involves a turn to the right as it follows the hands of a clock. If the rotation is clockwise, the angle has a negative measure. If the rotation is counterclockwise, the angle has a positive measure. Positive and Negative Angles The measure of an angle describes the magnitude and direction of the rotation of the ray from its initial position to its terminal position. Counterclockwise is the positive rotation direction and clockwise is the negative direction. The rotation of a clock's hands is the reference for defining rotational direction. What is the rule for a 90 degree counterclockwise rotation?ĩ0 Degree Rotation When rotating a point 90 degrees counterclockwise about the origin our point A(x,y) becomes A'(-y,x). 270° counterclockwise rotation: (x,y) becomes (y,-x).270° clockwise rotation: (x,y) becomes (-y,x). ![]()
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