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Which calculation does NOT give the area of this shape?

Class 6Area of Combined ShapesMensuration

A $9 \times 7 - 4 \times 3$
B $5 \times 7 + 4 \times 4$
C $9 \times 7 - 4 \times 4$
D $9 \times 4 + 5 \times 3$

Step-by-Step Solution

Correct ways:

9 \times 4 + 5 \times 3 = 51

;

5 \times 7 + 4 \times 4 = 51

;

9 \times 7 - 4 \times 3 = 63 - 12 = 51

. The missing corner is 4 cm wide and only 3 cm tall, so

9 \times 7 - 4 \times 4 = 47

is wrong.

Answer: C)

9 \times 7 - 4 \times 4

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