Calculate the area ABC of the triangle from the drawing data.

 
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If the base of a triangle is 'b' and the height is 'h'

then the area is = ?

We need to calculate the area of the triangle ABC

What is the length of the base (AB) of the triangle ABC = ?

What is the length of the height of the triangle ABC = ?

Now:

What is the length of the area of the triangle ABC = ?
 
So which is the one you do not know? Do you not know the base or is it the height that you do not know or is it both the base and the height which you do not know. For what ever it is worth, the diagram clearly shows the value of the base and the height of the triangle.
 
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