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Su Jiaoban fifth grade second volume mathematics supplementary exercise page 78 No.4 No.3 Find the area answer of the shadow part.
triangular

5+5 =10cm

10* 10/2=50cm？

3. 14*5? =78.5cm？

78.5/2=39.25cm？

50-39.25= 10.75cm？

It must be right. I did it.

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