The triangle below is isosceles.

1. Use Pythagoras' Theorem to calculate the perpendicular height () of the triangle.  (2 marks)
   

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2. Using your answer from (a), find the area of the triangle.  (2 marks)
   

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Calculate the area of the following triangles.

1.  
   (2 marks)

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2.   
   (2 marks)
   

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3.   
       (2 marks)
   

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Calculate the area of the following triangles.

1.  
   (2 marks)

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2.  
   (2 marks)
   
   

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3.  
     (2 marks)
   

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Label the base () and draw and label a line indicating the perpendicular height (), on the following triangles.

a.   (1 mark)		b.    (1 mark)		c.   (1 mark)

Identify the base () and the perpendicular height (), by labelling the following triangles.

a.   (1 mark)		b.    (1 mark)		c.   (1 mark)

A flag consists of three different coloured sections: red, white and blue.

The flag is 3 m long and 2 m wide, as shown in the diagram below.
 

The blue section is an isosceles triangle that extends to half the length of the flag.

The area of the blue section, in square metres, is

1.  1.5
2.  2
3.  3
4.  6

This triangle was made by cutting a square in half.
 

 
The perimeter of the triangle is 51.21 cm.

What is the area of the triangle?  (2 marks)

Jill is playing in her parents' rectangular courtyard.

The courtyard is measured at 6 metres by 10 metres.

Jill draws a triangle on the courtyard with chalk, pictured below.

What is the area of this triangle?  (2 marks)
 

A triangle is drawn on grid paper.
 

 What is the area of the triangle?

A triangle is drawn on grid paper.
  

 What is the area of the triangle?

Which triangle has an area greater than 4 square units?