Find out about Triangles
Adapted from : Burns, M. (1994) The Greedy Triangle. USA
What are the different parts of a triangle?
BASE
HEI GHT
What are the different parts of a triangle?
Finding the base and height of a triangle
The different types of triangles
Right Angled TrianglesAcute Angled TrianglesObtuse Angled Triangles
Right angle
SimilaritiesAll of them have 3 sides and 3 angles
Differences
Right Angled Triangles - One has a right angle and two angles less than 90°
Acute Angled Triangles – One has three angles less than 90 °
Obtuse Angled Triangles – One has an angle greater than 90 ° and two angles less than 90 °
Let’s identify the base and height of a right angled triangle
Let’s identify the base and height of n acute angled triangle
Let’s identify the base and height of an obtuse angled triangle
Think-Pair-Share
1. Draw a straight line on your Mini Whiteboard and label it base.
base
Think-Pair-Share2. Mark a point on top and within the length of the line.
.
base
Think-Pair-Share
3. From the dot, extend a line to join to each side at end of the first line.
.
Think-Pair-Share
4. Pass it to your partner and get him/her to identify the height of the given triangle.
.
Think-Pair-Share
Switch the role with your partner and repeat step1 to 6
Level 2…
1. Draw another straight line on the Mini Whiteboard and label it base.
base
Level 2…2. Mark another point on top but not within
(outside) the length of the line.
.
base
Level 2…3. From the dot, extend a line to join to each side at end of the first line.
.
base
Level 2…3. From the dot, extend a line to join to each side at end of the first line.
.
base
Level 2…4. Pass the triangle you have drawn to your partner and he/she will repeat the
step 5 and 6 as in the previous triangle.
base
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