Areas of triangles

rebelmaths

Two questions testing the application of the Cosine Rule when given two sides and an angle. In these questions, the triangle is always acute and both of the given side lengths are adjacent to the given angle.

Find angle and side in a right angled triangle.

rebelmaths

Area and perimeter of triangles.

Finding lengths of sides of triangles

Finding lengths of sides of triangles

Finding lengths of sides of triangles

Finding the lengths and angles within a right-angled triangle using: pythagoras theorem, SOHCAHTOA and principle of angles adding up to 180 degrees.

Find the area of a triangle where all three coordinates of the vertices are given.

An example of using the GeoGebra extension to ask the student to create a geometric construction, with marking and steps.

A question testing the application of the Cosine Rule when given three side lengths. In this question, the triangle is always acute. A secondary application is finding the area of a triangle.

A question testing the application of the Sine Rule when given two sides and an angle.  In this question the triangle is obtuse and the first angle to be found is obtuse.

A question testing the application of the Cosine Rule when given three side lengths. In this question, the triangle is always acute. A secondary application is finding the area of a triangle.

The javascript function edge(...) draws the edges of a triangle

Equilateral triangle

Area of triangle

Area of triangle

Finding lengths of sides of triangles