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# What Is This for?

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Worksheet

Math 124

Week 1

Worksheet for Week 1: Circles and lines
This worksheet is a review of circles and lines, and will give you some practice with algebra and with graphing. Also, this worksheet introduces the idea of “tangent lines” to circles. Later on in Math 124, you’ll learn how to ﬁnd tangent lines to many other types of curves. 1. Two circles, called C1 and C2 , are graphed below. The center of C1 is at the origin, and the center of C2 is the point in the ﬁrst quadrant where the line y = x intersects C1 . Suppose C1 has radius 2. C2 touches the x and y axes each in one point. What are the equations of the two circles? y y=x

C2 x

C1

Worksheet

Math 124

Week 1

2. Let C be the circle of radius 5 centered at the origin. The tangent line to C at a point Q is the line through Q that’s perpendicular to the radial line connecting Q to the center. (See picture.) Use this information to ﬁnd the equations of the tangent lines at P and Q below. y Q P x

Note: Later in Math 124, you’ll learn how to ﬁnd tangent lines to curves that are not circles!

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Worksheet

Math 124

Week 1

3. Sketch the circle of radius 2 centered at (3, −3) and the line L with equation y = 2x + 2. Find the coordinates of all the points on the circle where the tangent line is perpendicular to L. y

x

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Worksheet

Math 124

Week 1

4. Draw the circle with equation x2 +y 2 = 25 and the points P = (−3, −4) and Q = (−8, 0). Explain why P is on the circle. Is the line through P and Q tangent to the circle? How do you know?

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