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How to Rotate a Triangle 270° Clockwise About the Origin with Guided Steps
Mathematics
Grade 8 (Junior High School)
Question Content
Follow the guided instructions below to rotate the figure 270° clockwise about the origin. First step: Draw a circle centered at the center of rotation, such that one of the vertices of the figure is on the circle. The original triangle has vertices at (-6, 2), (-8, 3), (-2, 7).
Correct Answer
1. Circle: Centered at (0,0) with radius equal to the distance from origin to one vertex (e.g., radius √((-2)^2 +7^2)=√53 for vertex (-2,7)); 2. Rotated triangle vertices: (2, 6), (3, 8), (7, 2); 3. Final rotated triangle plotted with these new vertices.
Detailed Solution Steps
1
Step 1: Identify the original vertices of the triangle from the graph: Vertex A (-6, 2), Vertex B (-8, 3), Vertex C (-2, 7).
2
Step 2: Draw the required circle: Choose one vertex, for example C (-2,7). Calculate its distance from the origin (0,0) using the distance formula d=√(x²+y²)=√((-2)²+7²)=√53. Draw a circle centered at (0,0) with radius √53, which will pass through point C.
3
Step 3: Apply the 270° clockwise rotation rule about the origin: For any point (x,y), the rotated point (x',y') is given by (y, -x).
4
Step 4: Calculate each rotated vertex: For A (-6,2): (2, 6); For B (-8,3): (3, 8); For C (-2,7): (7, 2).
5
Step 5: Plot the new vertices (2,6), (3,8), (7,2) and connect them to form the rotated triangle.
Knowledge Points Involved
1
270° Clockwise Rotation Rule about the Origin
For a point (x, y) in the coordinate plane, rotating it 270° clockwise around the origin transforms it to the point (y, -x). This rule is derived from the standard rotation matrix for 270° clockwise, which is equivalent to a 90° counterclockwise rotation. It is used to find the position of points after this specific rotation without manually measuring angles.
2
Distance Formula in Coordinate Plane
The distance d between two points (x₁,y₁) and (x₂,y₂) is d=√((x₂-x₁)²+(y₂-y₁)²). When one point is the origin (0,0), this simplifies to d=√(x²+y²). It is used to calculate the radius of the circle centered at the origin passing through a given vertex, ensuring the vertex lies on the circle as required.
3
Coordinate Plane Graphing
This involves plotting points using their x (horizontal) and y (vertical) coordinates, then connecting points to form polygons. It is used to visualize the original figure, the auxiliary circle, and the final rotated figure to verify the rotation result.
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