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In the phrase 'area of a shape', both area and shape are nouns. In your mind, add 'the', it helps to show that they are nouns: 'the area of the shape'.
Area of any circle is: pi*radius*radius or pi*r^2
The area under an acceleration-time graph is equal to the object's velocity (not change in velocity).
Area of circle = pi*r2 where r is the radius. Area = pi*1.42 = 6.16 m2 (to 2 dp)
The one alternative to find the area of a rectangle is when you are given the length of one diagonal and its slope.