Area & Surface Area (7th Grade)
πr²
Area of a Circle
bh
Area of a Rectangle or Parallelogram
s²
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.
