7.4 Measuring Circles

Beginning Lesson

Aws4 request&x amz signedheaders=host&x amz signature=104724c45ac92184a9555449f6c3f7489049bed724a221ded974c729f5b0062c

As the World Turns (MS)

How fast is the Earth spinning? Students use unit rates to find the speed at which the planet rotates along the Equator, Tropic of Cancer, and Arctic Circle.

Topic: Expressions and Equations (EE), Ratios and Proportional Relationships (RP)

Middle Lessons

Aws4 request&x amz signedheaders=host&x amz signature=196f93e6989d9720e347bbb3f323a59582fca8828232eb940f9df2cb77f62b24

F-Stop in the Name of Love

How do camera settings affect the final image, and how can we use aperture and shutter speed to take better pictures? Students use the area of circles and fractions to explore how to properly expose a picture, and how photographers use depth of field and motion blur to get the perfect shot.

Topic: Geometry (G)
Aws4 request&x amz signedheaders=host&x amz signature=43771828fb0bf8cc04fae8056a3e12648eef0ea02aaac713b1437205e6043ef2

Spinning Your Wheels

Why do tires appear to spin backwards in some car commercials? Students apply unit rates and the formula for the circumference of a circle to determine what makes a spinning wheel sometimes look like it’s moving in the opposite direction of the car sitting on top of it.

Topic: Geometry (G), Ratios and Proportional Relationships (RP)

End Lesson

Aws4 request&x amz signedheaders=host&x amz signature=e31144de7d17b544e4d26123e52ff64fda409c2cfac95de36dd567b379255cef

Pizza Pi (MS)

Which size pizza is the best deal? Is it ever a good idea to buy the personal pan from Pizza Hut? Students use unit rates and percents, and the area of a circle to explore the math behind pizza bargains.

Topic: Geometry (G), Ratios and Proportional Relationships (RP)