In the figure below, if the radius of the big circle is 6, the area of its shadow is______ ．

As shown in the figure: the area of the shadow is equal to the area of the square ABCD, that is, 6 × 6 △ 2 × 4 = 18 × 4 = 72. A: the area of the shadow is 72. So the answer is: 72

In the figure below, the radius of the big circle is 8. What is the area of the shadow
Please help me see, why divide by 2 in the end

Because the diameter of the big circle 16 is the diagonal of the square, and the square of the diagonal of the square is twice the area of the square, so it is divided by 2

In the figure below, if the radius of the big circle is 6, the area of its shadow is______ ．

As shown in the figure: the area of the shadow is equal to the area of the square ABCD, that is, 6 × 6 △ 2 × 4 = 18 × 4 = 72. A: the area of the shadow is 72. So the answer is: 72

RELATED INFORMATIONS

1. The length of a machine part is 5mm, and the drawing is 4cm. The scale of this drawing is calculated
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In the figure below, if the radius of the big circle is 6, the area of its shadow is______ ．