What information do you need in order to find the area or circumference of a circle

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?

Jan is making cakes for her party. five cakes will serve 45? people. how many cakes will she need for 72people? what is the unit rate? graph your data.