**Mathematics Lesson Notes JSS3 Second Term**

**SCHEME OF WORK**

**Week Two and Three: Simultaneous Linear Equations in one or two Variables**

**Week Four: Geometry I**

**Week Five: Geometry II**

**Week Six: Area of Plane Shapes**

**Week Seven: Review of first half term’s work and periodic test**

**Week Eight: Area of plane figures cont’d**

**Week Nine: Trigonometry**

**Week Ten: Angles of Elevation and Depression **

**Week Eleven: Revision **

**Week Twelve: Examination**

# Mathematics Lesson Note For JSS3 (SecondTerm)

# Below are the 2022 complete JSS3 Second Term Mathematics Lesson Note

**Week Two and Three: Simultaneous Linear Equations in one or two Variables**

**INTRODUCTION:**

Consider two **linear equations** in two variables,* x* and *y*, such as

2*x – *3*y* = 4

3*x* + *y* = 1

Instead of one equation in one unknown, we have here two equations and two unknowns. In order to find a solution for this pair of equations, the unknown numbers *x* and *y* have to satisfy **both** equations. Hence, we call this system or pair of equations or **simultaneous equations**. We now focus on various methods of solving simultaneous equations. To learn more, click **here**.

**Week Four: Geometry I**

**INTRODUCTION:**

Plane shapes in Mathematics are any closed, flat, 2 – dimensional shapes. A closed shape has a different attribute such as the number of sides and corners. A side is a straight line that makes part of the shape, and a corner where two side meets.

Most of the objects that we encounter can be associated with basic shapes**.** In geometry now we will learn about the definition of plane figures. But before that let us recall, we know that solid shapes have many surfaces. To learn more, click **here**.

**Week Five: Geometry II**

**INTRODUCTION:**

A scale factor is the ratio of the big shape to the smaller shape.

Area factor is the ratio of the big shape’s area to the smaller shape’s area.

The figure below represents two similar rectangles of different sizes. To learn more, click **here**.

**Week Six: Area of Plane Shapes**

**INTRODUCTION:**

**Area of a trapezium**

A trapezium is a quadrilateral that has only one pair of parallel sides.

The area of the trapezium is given by the following formula where *a* and *b* are the lengths of the parallel sides and *h*is the perpendicular distance between the parallel sides.

A = ½(a + b)h. To learn more, click **here**.

**Week Seven: Review of first half term’s work and periodic test**

This week, we would be doing a revision of all that we learned, in the first half of the term.

**Week Eight: Area of plane figures cont’d**

**INTRODUCTION:**

**Week Nine: Trigonometry**

**INTRODUCTION:**

The **sine** (abbreviated “**sin**“) and cosine (“**cos**“) are the two most prominent trigonometric functions. All other trig functions can be expressed in terms of them. In fact, the sine and cosine functions are closely related and can be expressed in terms of each other.

Definition 1 is the simplest and most intuitive definition of the sine and cosine functions. The sine definition basically says that, on a right triangle, the following measurements are related: To learn more, click **here**.

**Week Ten: Angles of Elevation and Depression**

**Week Eleven: Revision**

This week, we would be doing a revision of all that we learned during the term.

**Week Twelve: Examination**

Afterwards, we would write an examination, which would test our knowledge of what has been taught so far.