If you love shapes and figures, then this is the right chapter for you. However, if you are one of those who do not like to look at figures and shapes then this lesson will certainly change your mind.

Geometry is all about shapes, sizes and figures. It concerns measurement of area, perimeters and volumes of a certain shape or figure. So, basically everything in this chapter would tackle about the subjects mentioned above.

Area is defined as any part of a space. Solving the area of any shape or figure varies since each shape has its own formula. The unit used to express this measurement is showed in squared form. For example, cm2, m2, km2. Moreover, only units of length can be used to express this measurement.

Perimeter is the measurement around the shape or object. Just like solving for the area, solving for the perimeter of a certain shape or object varies. This measurement also uses the units of length. However, the measurement would follow the unit of the sides of the shape or object. For example, m, cm, km.

Volume is a measurement expressed by the space an object occupies. The units used for this expression are also the units of length. However, the resulting unit would be cubed. For example cm3, m3, km3.

A square is a figure that has four equal sides.

Area of the square

Area of the square = s2

The formula above only implies that we square one side of the square since all its sides are equal.

**Examples:**

- S = 4 m

= 4 m * 4 m

= 16 m2

- S = 5 cm

= 5 cm * 5 cm

= 25 cm2

- S = 10 km

= 10 km * 10 km

= 100 km2

- S = 8 m

= 8 m * 8 m

= 64 m2

- S = 9 cm

= 9 cm * 9 cm

= 81 cm2

Perimeter of the square = 4s

The formula above means that we can solve for the perimeter of the square by multiplying one side with four. Since a square has four equal sides.

**Examples:**

- S = 2 m

= 4 * 2 m

= 8 m

- S = 8 cm

= 4 * 8 cm

= 32 cm

- S = 4 mm

= 4 * 4 mm

= 16 mm

- S = 15 km

= 4 * 15 km

= 60 km

- S = 12 m

= 4 * 12 m

= 48 m

A rectangle has 2 equal sides.

Area of the perimeter

Area of the perimeter = LW

Where, L = length and W = width

So we just multiply the values of length and width.

**Examples:**

- L = 4 m , W = 5 m

= 4m * 5 m

= 20 m2

- L = 6 cm , W = 3 cm

= 6 cm * 3 cm

= 18 cm2

- L = 2 m , W = 6 m

= 2 m * 6 m

= 12 m2

- L = 3 mm , W = 5 mm

= 3 mm * 5 mm

= 15 mm2

- L = 10 km , W = 15 km

= 10 km * 15 km

= 150 km2

Perimeter of rectangle = 2L + 2W

The formula means that we have to multiply each equal side with 2 and add the resulting measurements.

**Examples:**

- L = 5 km , W = 10 km

= (2 * 5 km) + (2 * 10 km)

= 10 km + 20 km

= 30 km

- L = 6 cm , W = 8 cm

= (2 * 6 cm) + (2 * 8 cm)

= 12 cm + 16 cm

= 28 cm

- L = 10 m , W = 20 m

= (2 * 10 m) + (2 * 20 m)

= 20 m + 40 m

= 60 m

- L = 15 km , W = 12 km

= (2* 15 km) + (2 * 12 km)

= 30 km + 24 km

= 54 km

- L = 25 mm , W = 30 mm

= (2* 25 mm) + (2 * 30 mm)

= 50 mm + 60 mm

= 110 mm

- Absolute Values
- Adding and Subtracting Fractions
- Addition of Decimals
- Algebra Linear Equations
- Algebra Quadratic Equations
- Algebra Simultaneous Equations
- Algebraic Properties
- Algebraic Function
- Analyzing and Integrating
- Asymptotes
- Bar Graphs
- Basics of Statistics
- Circular Permutations
- Combinations
- Complex Numbers
- Complex Numbers AddSub
- Complex Numbers Division
- ComplexNumbers Multiplication
- Complex Numbers Properties
- Composite Functions
- Cube and Cube Roots
- Data collection Add Multipli Rules
- Datacollection GroupedMean
- Datacollection Mean
- Datacollection Median
- Datacollection Mode
- Datacollection Probabilitybasics
- Datacollection Probabilityevents
- Dividing Rational Numbers
- Division of Decimals
- Domain of SquareRootFunction
- EquationsReducibleQuadratic
- Exponential Functions
- ExponentialLogarithmicFunction
- Factorization
- FactorizationAnyQPolynomial
- FactorizationMonicQPolynomial
- Fractions & Decimal Conversion
- Functions
- Geometry Basics
- Graph of Rational Functions
- Graph of SquareRootFunction
- GraphicalRepresentation
- Graph of Complex Numbers
- Graphs Functions
- HighestCommonFactor
- Inequalities
- Inverse Square Functions
- Inverse of a Function
- Justifying Solutions
- LeastCommonMultiple
- Linear Equations2Variables
- LinearEquations3Variables
- Linear Equation System
- Linear Equation Graphs
- Linear Inequalities Graphs
- Maxima Minima Zeros
- More Functions
- Multiplication of Decimals
- Multiplying Rational Numbers
- Multiplying Two Polynomials
- Other Functions
- Permutations
- Pictorial BarChart
- Pictorial Bivariatedata
- Pictorial BoxPlots
- Pictorial FrequencyTable
- Pictorial Histogram
- Pictorial LineCharts
- Pictorial PieChart
- Pictorial StemLeafPlot
- Polynomials Addition
- Polynomials Division
- Polynomials Multiplication
- Predicting Values
- Problem Solving Strategies
- Quadratic Equation
- QuadraticEquationsFormula
- QuadraticEquationsSolutions
- QuadraticInequalities
- Rational Behind Functions
- Rational Expression
- Rational Functions
- Real Numbers
- Reciprocal Functions
- Recursive Multiplication
- Rational Numbers
- Review of functions
- Review of Sets and Relations
- Rounding Numbers
- Scientific Notation
- Simple Probabilities
- SimplifyingRationalExpressions
- SolutionQuadratEquawhen
- Solving Fractions
- SolvingQuadraticEquations
- Square of a Binomial
- SquareRootFunctions
- SquareRootFunInequalities
- Squares and Square Roots
- Step Function
- Subtraction of Decimals
- Types of Functions
- Unit Conversions Measurements
- WordProblemsQE