Transcript 7-7 Areas of Circles and Sectors

L.E.Q. How do you find the areas of circles,
sectors, and segments of circles?

The area of a circle is the product of pi and
the square of the radius.

How much more pizza is in a 12-in.-diameter
pizza than in a 10-in. pizza?



A sector of a circle is a region bounded by an
arc of the circle and the two radii to the arc’s
endpoints.
You name a sector using one arc endpoint,
the center of the circle, and the other arc
endpoint.
The slice of pizza below is sector XOY of
circle O.

The area of a sector of a circle is the product
of the ratio arc measure 360 and the area of the
circle.

Find the area of sector ZOM. Leave your
answer in terms of
.

A part of a circle bounded by an arc and the
segment joining its endpoints is a segment of
a circle.


To find the area of a segment for a minor arc,
draw radii to form a sector.
The area of the segment equals the area of
the sector minus the area of the triangle
formed.

Find the area of the shaded segment. Round
your answer to the nearest tenth.

Pgs 397-398 #s 2-12 even, 17-19 all, 22,
24, 26.