lesson 12-4+5

Question 1

secant

Answer 1

a line that intersects a circle at two points

Question 1

thm 12-13

Answer 1

the measure of an angle formed by two lines that intersects inside a circle is half the sum of the measures of the intersected arcs
m<1=1/2(x+y)

Question 2

thm 12-14

Answer 2

the measure of an angle formed by two lines that intersects outside a circle is half the sum of the measures of the intersected arcs
m<1=1/2(x-y)

Question 3

thm 12-15

Answer 3

for a given point and circle the product of the lengths of the two segments from the point to the circle is constant along any line through the point and circle
ab=cd
(w+x)w=(y+z)y

Question 4

thm 12-16

Answer 4

Equation of a circle: (x-h)^2+(y-k)^2=r^2