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ACT Math area perimeter
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ACT Math Formulas
What is the area of a square?
Side X Side or Side Squared
Side X Side or Side Squared
side
side
What is the area of this square?
5
5 x 5 = 25
5
What is the area of this square?
10
10 x 10 = 100
10
What is the area of a rectangle?
Length X Width = Area
Length X Width = Area
Width
length
What is the area of this rectangle?
3
7
3 x 7 = 21
3
7
What is the area of this rectangle?
10
12
10 x 12 = 120
10
12
What is the area of a triangle?
½ (base x height) = area of triangle
½ (base x height) = area of triangle
Base
Height
What is the area of this triangle
5
10
½ (5 x 10) = ½ (50) = 25
5
10
½ (5 x 10) = ½ (50) = 25
5
10
½ (5 x 10) = ½ (50) = 25
5
10
What is the area of this triangle
7
10
½ (7 x 10) = ½ (70) = 35
7
10
½ (7 x 10) = ½ (70) = 35
7
10
½ (7 x 10) = ½ (70) = 35
7
10
What is the PERIMETER of a square?
Side+Side+Side+Side OR 4 x Side
Side+Side+Side+Side OR 4 x Side
Side+Side+Side+Side OR 4 x Side
side
side
side
side
What is the perimeter of this square?
5
5+5+5+5 OR 4 x 5 = 20
5
5+5+5+5 OR 4 x 5 = 20
5
5+5+5+5 OR 4 x 5 = 20
5
What is the perimeter of this square?
10
10+10+10+10 OR 4 x 10 = 40
10
10+10+10+10 OR 4 x 10 = 40
10
10+10+10+10 OR 4 x 10 = 40
10
What is the PERIMETER of a rectangle?
(2 x Length) + (2 x Width)
(2 x Length) + (2 x Width)
width
length
width
length
What is the perimeter of this rectangle?
4
7
2 (7) + 2 (4)
4
7
7
4
14 + 8
4
7
7
4
14 + 8 = 22
4
7
7
4
What is the perimeter of this rectangle?
6
9
2 (9) + 2 (6)
6
9
9
6
18 + 12
6
9
9
6
18 + 12 = 30
6
9
9
6
What is the CIRCUMFERENCE of a circle?
2𝜋𝑟
2𝜋𝑟
What is the circumference of this circle?
= =
= =
= =
= =
= =
= =
Circumference or perimeter of this circle equals 31.4
What is the circumference of this circle?
= =
= =
= =
= =
= =
Circumference or perimeter of this circle equals 314
= =
50
What is the area of a circle?
What is the area of a circle?
A = pr2
What is the area of a circle?
A = p102
10
What is the area of a circle?
A = p100
10
What is the area of a circle?
A = 3.14 * 100
10
What is the area of a circle?
A = 314
10
What is the area of a circle?
What is the area of a circle?
A = pr2
