A circle had a radius 20 cm. What is the area?
1 answer:
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Just did a specific one of these; let's do the general case.
The point nearest the origin is (a,b).
The line from the origin through the point is
The line we seek is perpendicular to this one. We swap the coefficients on x and y, negating one, to get the perpendicular family of lines. We set the constant by plugging in the point (a,b):
That's standard form; let's plug in the numbers:
1. Both are corresponding angles, hence they both are equal, so,
Ans. C) 2
2. They both are in interior corressponding, hence their sum is equal to 180°, so,
Ans. D) 7
3. They both are in interior corressponding, hence their sum is equal to 180°, so,
Ans. A) -10
4. Both are corresponding angles, hence they both are equal, so,
Ans. A) 6
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