Calculating Perimeters of Shapes

This video tutorial introduces the concept of perimeter and provides formulas for calculating the perimeter of various shapes, including rectangles, squares, triangles, and circles. It explains how to determine the perimeter by adding the lengths of sides and demonstrates the use of formulas for efficiency. The video also covers the concept of circumference for circles, providing both exact and approximate calculations.

What is the perimeter of a two-dimensional shape?

• The area inside the shape

• The distance around the shape

• The volume of the shape

• The diagonal of the shape

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CCSS.4.MD.A.3

How do you calculate the perimeter of a rectangle?

• Add the lengths of all four sides

• Multiply the length by the width

• Multiply the length by four

• Add the length and width, then multiply by two

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CCSS.4.MD.A.3

If a rectangle has sides of 12 cm and 5 cm, what is its perimeter?

• 60 cm

• 34 cm

• 24 cm

• 17 cm

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CCSS.4.MD.A.3

What is the formula for the perimeter of a square?

• 4 times the length of one side

• 2 times the length plus 2 times the width

• The sum of all four sides

• The length of one side squared

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CCSS.4.MD.A.3

If each side of a square is 6 inches, what is its perimeter?

• 18 inches

• 12 inches

• 36 inches

• 24 inches

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CCSS.3.MD.D.8

How do you find the perimeter of a triangle?

• Multiply the length of one side by three

• Use the formula 2πr

• Add the lengths of all three sides

• Multiply the base by the height

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CCSS.3.MD.D.8

What is the perimeter of a triangle with sides 9 ft, 5 ft, and 10 ft?

• 24 ft

• 19 ft

• 14 ft

• 30 ft

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CCSS.7.G.B.4

What is the term used for the perimeter of a circle?

• Diameter

• Area

• Radius

• Circumference

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CCSS.7.G.B.4

What is the formula for the circumference of a circle?

• d/2

• 2r

• πr²

• πd or 2πr

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CCSS.7.G.B.4

If the radius of a circle is 4 meters, what is its circumference in terms of π?

• 2π meters

• 8π meters

• 4π meters

• 16π meters

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CCSS.7.G.B.4