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Aloiza [94]
3 years ago
6

ABC is reflected over the y-axis

Mathematics
1 answer:
uranmaximum [27]3 years ago
8 0

Answer:

A'(-1, 5), B'(-2, 3), and C'(-5, 4)

Step-by-step explanation:

Given the coordinate (x, y), if reflected over the y-axis, the resulting coordinate will be (-x, y):

Given the coordinates of the triangle expressed as:

A(1. 5), B(2, 3), and C(5, 4)

When these coordinates are reflected over the y-axis, the results will be:

A'(-1, 5), B'(-2, 3), and C'(-5, 4)

<em>Note that the x coordinates were negated while the y-coordinates remains unchanged</em>

<em></em>

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We have 112.5 = 225/2; cos112.5 < 0 because 90 < 112.5 < 180;
cos 112.5 = cos(225/2);
We use the trigonometric formula: cos(x/2) = - \sqrt{ \frac{1+cosx}{2} };
Then, cos(225/2) = - \sqrt{ \frac{1+cos225}{2} };
We have the formula: cos(270 - x) = -sinx (because cos(a-b) = cosacosb + sinasinb);
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irga5000 [103]

Answer:

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General Formulas and Concepts:

<u>Pre-Algebra</u>

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<u>Step 2: Expand</u>

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