# 1.7 Circle Constructions

```Circles
Homework Review
Mental Math
Solve these problems in your math
notebook
5+5=
50+40=
1+8=
60+70=
8+6=
70+80=
9+3=
Math Message
Take a sheet of paper, read the
the question.
Lesson Components
• A circle is the set of all points that
go around a center point the same
distance away. Find the center point
of the circles.
Circles
• The radius of a circle is a line
segment from the center of a circle
to any point on the circle
Circles
• Draw the radius of each circle
Diameter
• The diameter of a circle is a line
segment from one point on a circle to
another point that goes through the
center of the circle
Diameter
• Draw the diameter on these circles
Math journal p. 18
Concentric circles
• Circles with the same center are
called
CONCENTRIC CIRCLES
They do not intersect or cross
Wrapping it all up
• Use your compass to draw a circle
• Use your compass to draw a circle
and label the diameter
• Use your compass to draw a set of
concentric circles
Tonight’s Homework