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# Lesson proper for base and height

## by Essy08 on Mar 07, 2011

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## Lesson proper for base and heightPresentation Transcript

• 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 Triangles
• Acute Angled Triangles
• Obtuse Angled Triangles
Right angle
• Similarities
• All 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
• Draw a straight line on your Mini Whiteboard and label it base.
• base
• Think-Pair-Share
• 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…
• 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…
• 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