Area & Surface Area (7th Grade)

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πr²

Area of a Circle

bh

Area of a Rectangle or Parallelogram

Area of a Square

½(b₁ + b₂)h

Area of a Trapezoid

½bh

Area of a Triangle

7.07 ft²

Area of a circle with a diameter of 3 ft.

15.9 ft²

Area of a circle with a diameter of 4.5

19.63 ft²

Area of a circle with a diameter of 5 ft.

28.26 ft²

Area of a circle with a radius of 3ft.

63.59 ft²

Area of a circle with a radius of 4.5 ft.

78.5 ft²

Area of a circle with a radius of 5 ft.

98 ft²

Area of a parallelogram with a height of 7 ft. and base of 14 ft.

42 ft²

Area of a parallelogram with a height of 7 ft. and base of 6 ft.

25.5 ft²

Area of a parallelogram with a height of 7.5 ft. and base of 3.4 ft.

10 in²

Area of a rectangle with side lengths of 2.5in and 4in

10 m²

Area of a rectangle with side lengths of 2m and 5m.

36 m²

Area of a rectangle with side lengths of 4m and 9m.

4 ft²

Area of a square with a side length of 2ft.

20.25ft²

Area of a square with a side length of 4.5ft.

36 in²

Area of a square with a side length of 6in.

47.5 ft²

Area of a trapezoid with bases of 12 ft. and 7 ft. and height of 5 ft.

32 ft²

Area of a trapezoid with bases of 3 ft. and 5 ft. and height of 8 ft.

22.6 ft²

Area of a trapezoid with bases of 4.2 ft. and 7.1 ft. and height of 4 ft.

60 ft²

Area of a triangle with a base of 10 ft. and a height of 12 ft.

7.5 ft²

Area of a triangle with a base of 3 ft. and a height of 5 ft.

40.5 ft²

Area of a triangle with a base of 9 ft. and a height of 9 ft.

2πr or πd

Circumference of a Circle

12.56 ft

Circumference of a circle with a diameter of 4ft.

22.61 ft

Circumference of a circle with a diameter of 7.2 ft.

25.12 ft.

Circumference of a circle with a diameter of 8 ft.

62.8 ft

Circumference of a circle with a radius of 10 ft.

45.22 ft

Circumference of a circle with a radius of 7.2 ft.

50.24 ft

Circumference of a circle with a radius of 8 ft.

2b + 2h

Perimeter of a Rectangle

4s

Perimeter of a Square

2lw + 2lh + 2wh

Surface Area

202 ft²

Surface Area of a rectangular prism with dimensions of 7 ft., 3 ft., and 8 ft.

52 ft²

Surface area of a rectangular prism with dimensions of 2 ft., 3 ft., and 4 ft.

188 ft²

Surface area of a rectangular prism with dimensions of 2 ft., 5 ft., and 12 ft.

198 ft²

Surface area of a rectangular prism with dimensions of 3 ft., 6 ft., and 9 ft.

148 ft²

Surface area of a rectangular prism with dimensions of 4 ft., 5 ft., and 6 ft.

24 ft³

Volume of a rectangular prism with dimensions of 2 ft., 3 ft., and 4 ft.

130 ft³

Volume of a rectangular prism with dimensions of 2 ft., 5 ft., and 13 ft.

162 ft³

Volume of a rectangular prism with dimensions of 3 ft., 6 ft., and 9 ft.

120 ft³

Volume of a rectangular prism with dimensions of 4 ft., 5 ft., and 6 ft.

168 ft³

Volume of a rectangular prism with dimensions of 7 ft., 3 ft., and 8 ft.


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