Shape

Showing 17–32 of 143 results

Shape

Finding the Area of a Circle

Students learn how a circle can be formed into a parallelogram and rectangle so the area is derived as A =πr2.  ...

Finding the Area of a Rectangle

Students learn about finding the area of a rectangle.  They progress from counting the squares inside and multip...

Finding the Area of a Triangle

Students practice finding the area of a triangle.  As the lesson progresses students learn how to use the formul...

Finding the Circumference of a Circle

Students learn about finding the circumference of a circle as a multiple of π and as a decimal correct to 3 sign...

Finding the Original Amount – Percentage Changes

Students learn how to calculate the original amount after a simple percentage change.  Learning progresses from ...

How to perform rotations about a Centre

Students learn how to rotate an object on a grid using a centre, direction and amount of turn.  As learning prog...

Interior Angles of Polygons

Students learn how to calculate interior angles of polygons.  Learning progresses from finding an interior angle...

Introducing Angles in a Quadrilateral

Students are introduced to angles in a quadrilateral by investigating how they are formed from two triangles.  M...

Introducing Angles in a Triangle

Building on angles on a straight line and vertically opposite angles students are taught why angles in a triangl...

Introducing Angles on a Straight Line

Using angles on a straight line have a sum of 180° students learn how to calculate missing angles and set up and...

Lengths in Right-Angled Triangles

Students learn how to use Pythagoras' Theorem to calculate missing lengths in right-angled triangles.    As lea...

Measuring and Naming Angles

Students learn about the different types of angles and how to measure them to within one degree.  As learning pr...

Perimeter of Complex Shapes

Students learn how to find the perimeter of complex shapes.  Learning progresses from counting the distance arou...

Perpendicular Bisectors and Equidistant Paths

Students learn how to construct a perpendicular bisector and equidistant path using a pair of compasses and rule...

Planes of Symmetry in 3D Shapes

Students learn how to identify the planes of symmetry in 3D shapes.  Learning progresses from sketching the plan...

Problem Solving with Angles of Polygons

Students learn how to apply the interior and exterior angle properties of polygons to solve a variety of problem...

Mr Mathematics Blog

Comparing Datasets using the Mean and Range

In my experience, students, in general, find the concept of a mean straightforward to calculate and understand. However, the mean alone does not provide a complete picture of a set of data. To achieve this, a measure of spread is also required. The range is the simplest measure that can be used for this. Not […]

Solving Problems with Angles in Parallel Lines

Solving problems with angles in parallel lines is like solving a murder mystery.  One clue leads on to the next and the next until the murderer is found.  However, it doesn’t end there.  The detectives need to explain their reasoning in court using the relevant laws and procedures should the murderer plead not guilty.  If […]

Solving Two Step Equations using the Balance Method

An equation is when one expression, or term, is equal to another.  To solve an equation means to find the value of the variable (represented by a letter) that makes the two expressions equal.  There are two types of equations for secondary school mathematics, linear and none-linear.  In this blog I write about how I […]