1
Q
Square Area
A
A = S^2
2
Q
Rectangle Area
A
A = bh
3
Q
Parallelogram Area
A
A = bh
4
Q
Triangle Area
A
A = 1/2 bh
5
Q
Rhombus Area
A
A = (d one * d two) ÷ 2
6
Q
Kite Area
A
A = (d one * d two) ÷ 2
7
Q
Trapezoid Area
A
A = 1/2 h (b one + b two)
8
Q
Circle Area
A
A = πr^2
9
Q
Sector of a Circle Area
A
Area = (arc measure/360) * πr^2
10
Q
Segment Area (not a formula)
A
Subtract the area of the triangle from the area of the sector
11
Q
Area of regular polygons
A
A = 1/2ap
12
Q
Arc length formula
A
AB = (AB ÷ 360) * 2πr
13
Q
Central angle is the same as what in degrees
A
arc in degrees (not length)
14
Q
Circumference of a Circle
A
2πr
15
Q
ALL Triangle Formulas
A
5bh
.5bcsinA
.25s^2√3 )
16
Q
Number of Sides of a Regular Polygon
A
S = 180 (n - 2)
17
Q
Angle Between apothem and radius
A
180/n (number of sides)
9th Grade
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