Geometry Formulas You Need to Know for the HiSET® Math Test
The HiSET® test is so straightforward that it gives you a formula chart to use during the test Here at Union Test Prep, we have a sneak peek of what you’ll see on that formula chart, but you’ll probably need a little extra assistance, as well. There are more equations applicable in this test than the ones on the “official” formula chart you’ll be given during the test. So, in the following chart, you’ll find the Geometry formulas that won’t be given to you but that you need to know for the HiSET® Math Test.
We also have two other charts of formulas that are not given to you during the test and a preview of the chart of formulas you will be given during the HiSET Math Test session.
Algebra Formulas You Need to Know for the HiSET® Math Test
Statistics and Probability Formulas You Need to Know for the HiSET® Math Test
Formulas You Will Be Given for the HiSET® Math Test
Geometry Formulas for the HiSET® Math Test
Category  Formula  Symbols  Comment 

Triangles  \(P=s_1+s_2+s_3\)  \(P\) = Perimeter of a triangle \(s_n\) = side length 

Triangles  \(A = \frac{1}{2} \cdot b \cdot h\)  \(A\) = Area of a triangle \(b\) = base \(h\) = height 

Triangles  \(\Sigma \theta = 180^\circ\)  \(\Sigma \theta\) = Sum of the interior angles  
Triangles  \(a^2 + b^2 = c^2\)  \(a, \ b\) = Legs of a right triangle \(c\) = Hypotenuse of a right triangle 
Pythagorean Theorem 
Quadrilaterals  \(P = 4 \cdot s\)  \(P\) = Perimeter of a square \(s\) = Side length 

Quadrilaterals  \(P = 2 \cdot l + 2 \cdot w\)  \(P\) = Perimeter of a rectangle \(l\) = Length \(w\) = width 

Quadrilaterals  \(A=s^2\)  \(A\) = Area of a square \(s\) = Side length 

Quadrilaterals  \(A = l \cdot w\)  \(A\) = Area of a rectangle \(l\) = Length \(w\) = Width 

Quadrilaterals  \(A = h \cdot \dfrac{b_1+b_2}{2}\)  \(A\) = Area of a trapezoid \(h\) = Height \(b_n\) = Base \(n\) 

Quadrilaterals  \(\Sigma \theta = 360^\circ\)  \(\Sigma \theta\) = Sum of the interior angles  
Regular Polygons  \(\Sigma \theta = 180^\circ \cdot (n2)\)  \(\Sigma \theta\) = Sum of the interior angles \(n\) = Number of sides 

Regular Polygons  \(\theta = \dfrac{180 \cdot (n2)}{n}\)  \(\theta\) = Interior angle measure \(n\) = Number of sides 

Circles  \((xh)^2 + (yk)^2 = r^2\)  \((h,k)\) = Center of a circle \(r\) = Radius 
Standard form of a circle 
Circles  \(C=2 \cdot \pi \cdot r = \pi \cdot d\)  \(C\) = Circumference (perimeter) of a circle \(r\) = radius \(d\) = diameter \(\pi\) = 3.14 

Circles  \(S = r \cdot \theta\)  \(S\) = Arc length \(r\) = Radius \(\theta\) = Central angle (in radians) 

Circles  \(A= \pi \cdot r^2\)  \(A\) = Area of a circle \(\pi\) = 3.14 \(r\) = Radius 

Transformations  \((x, y) \rightarrow (x, y)\)  Reflection xaxis  
Transformations  \((x, y) \rightarrow (x, y)\)  Reflection yaxis  
Transformations  \((x, y) \rightarrow (x, y)\)  Reflection origin  
Transformations  \((x, y) \rightarrow (y, x)\)  Reflection Line \(y=x\)  
Transformations  \((x, y) \rightarrow (y, x)\)  Reflection Line \(y=x\)  
Transformations  \((x, y) \rightarrow (y, x)\)  Rotation \(90^\circ\) Counterclockwise  Rotation around the origin 
Transformations  \((x, y) \rightarrow (x, y)\)  Rotation \(180^\circ\) Counterclockwise  Rotation around the origin 
Transformations  \((x, y) \rightarrow (x+a, y+b)\)  Translation  
Transformations  \((x, y) \rightarrow (rx, ry)\)  Dilation \(r\) = Scale factor  
3Dimensional Objects  \(V= l \cdot w \cdot h\)  \(V\) = Volume of a rectangular prism \(l\) = Length \(w\) = Width \(h\) = Height 

3Dimensional Objects  \(SA = \Sigma A_{fi}\)  \(SA\) = Surface area of a prism \(A_{fi}\) = Area of face \(i\) 

3Dimensional Objects  \(V=\frac{1}{3} \cdot (l \cdot w \cdot h)\)  \(V\) = Volume of a pyramid \(l\) = Length \(w\) = Width \(h\) = height 

3Dimensional Objects  \(SA = \Sigma A_{fi}\)  \(SA\) = Surface area of a pyramid \(A_{fi}\) = Area of face \(i\) 

3Dimensional Objects  \(V= \pi \cdot r^2 \cdot h\)  \(V\) = Volume of a cylinder \(r\) = Radius \(h\) = Height 

3Dimensional Objects  \(SA = 2B +(C \cdot h)\)  \(SA\) = Surface area of a cylinder \(B\) = Area of base \(C\) = Circumference of base \(h\) = Height 

3Dimensional Objects  \(V = \frac{4}{3} \cdot \pi \cdot r^3\)  \(V\) = Volume of a sphere \(r\) = Radius 

3Dimensional Objects  \(SA = 4 \cdot \pi \cdot r^2\)  \(SA\) = Surface area of a sphere \(r\) = Radius 

Density  \(\rho = \dfrac{m}{v}\)  \(\rho\) = Density \(m\) = Mass \(v\) = Volume 
![Hiset Geometry Formulas](
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