Unit 2: Ratios and Proportional Relationships

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Presentation transcript:

Unit 2: Ratios and Proportional Relationships 7th grade/6th grade accelerated math

4.4 – Ratios and Pi

Exploring Circumference

Explore Activity Use a measuring tape to find the circumference of 5 circular objects Then, measure the distance across each item to find its diameter Record each of the measurements of each object in the table below Object Circumference C Diameter d 𝑪 𝒅

Determining Proportionality in Circles

Finding Missing Parts of a Circle You know that 𝐶 𝑑 =𝜋 for all circles You can use this ratio to find unknown measures Ex: ”The circumference of circle A is approximately 94cm. The diameter of circle A is 30cm. The diameter of circle B is 15cm. What is the circumference of circle B?”