Download - Lesson proper for base and height
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Find out about Triangles
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Adapted from : Burns, M. (1994) The Greedy Triangle. USA
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What are the different parts of a triangle?
BASE
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HEI GHT
What are the different parts of a triangle?
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Finding the base and height of a triangle
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The different types of triangles
Right Angled TrianglesAcute Angled TrianglesObtuse Angled Triangles
Right angle
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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 °
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Let’s identify the base and height of a right angled triangle
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Let’s identify the base and height of n acute angled triangle
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Let’s identify the base and height of an obtuse angled triangle
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Think-Pair-Share
1. Draw a straight line on your Mini Whiteboard and label it base.
base
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Think-Pair-Share2. Mark a point on top and within the length of the line.
.
base
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Think-Pair-Share
3. From the dot, extend a line to join to each side at end of the first line.
.
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Think-Pair-Share
4. Pass it to your partner and get him/her to identify the height of the given triangle.
.
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Think-Pair-Share
Switch the role with your partner and repeat step1 to 6
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Level 2…
1. Draw another straight line on the Mini Whiteboard and label it base.
base
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Level 2…2. Mark another point on top but not within
(outside) the length of the line.
.
base
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Level 2…3. From the dot, extend a line to join to each side at end of the first line.
.
base
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Level 2…3. From the dot, extend a line to join to each side at end of the first line.
.
base
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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