10.1 Lines & Segments that intercept circles

circle- set of all points on a plane that are a fixed distance from the center

chord-segment where both endpoints are on the circle

diameter- type of chord that passes through the center of the circle

secant-line with 2 points on the circle

radius-distance from center to any point on the circle

tangent- line that touches circle at 1 point of tangency(always perpendicular to radius)

Coplanar Circles

10.2 Finding arc measures

major arc- more that 180 degrees

Minor arc-less than 180 degrees

semi-circle-diameter= 180 degrees

central angle-angle formed by two radii

arc=central angle

10.7 Circle in a coordinate plane

center of circle (h,k)

point of intersection (x,y)

parent function; x²+y²=r²

standard form; (x-h)²(x-k)²=r²