Room 28
Learning Objectives
Level 4
To investigate and then remember that the angles in a triangle add to 180o.
How do we know that the angles in an equilateral triangle will always be 60o?
Level 5
To investigate and then remember that the sum of the angles in a quadrilateral is 360o.
Three angles are 110, 90 and 80 - what is the missing angle?
To be able to define and then calculate the exterior angle of a triangle and quadrilateral.
Can you prove that the external angle of a triangle is equal to the two
opposite sides?
Resources
Level 4
Introduction to triangles.
Ten Ticks 5, 3, page 19-20
Triangle Trail (print)
CIMT Interactive: Finding Angles in Triangles
Level 5
Investigate quadrilaterals.
Ten Ticks 5, 3, page 21
Introduction to triangles.
Ten Ticks 5, 3, page 19-20
Triangle Trail (print)
CIMT Interactive: Finding Angles in Triangles
Level 5
Investigate quadrilaterals.
Ten Ticks 5, 3, page 21
Learning Objective for next lesson:
Level 5
To be able to construct Side-Angle-Side (SAS) & Angle-Side-Angle (ASA) triangles.
Are there are triangles that you can see cannot be constructed, even without trying?
Level 6
To be able to construct Side-Side-Side (SSS) triangles.
If you multiply the side lengths all by two, what is the effect on the shape of the triangle?
