Official NCERT Book for Class 9 Mathematics: Chapter 09 Areas Of Parallelograms and Triangles
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(A) Main Concepts and Results
The area of a closed plane figure is the measure of the region inside the figure:
The shaded parts (Fig.9.1) represent the regions whose areas may be determined by
means of simple geometrical results. The square unit is the standard unit used in
measuring the area of such figures.
• If Δ ABC ≅ Δ PQR, then ar (Δ ABC) = ar (Δ PQR)
Total area R of the plane figure ABCD is the sum of the areas of two triangular
regions R1 and R2, that is, ar (R) = ar (R1) + ar (R2)
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