As in figure，the area of square&nbs

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As in figure，the area of square ABCD is 169cm²and the area ofthombus BCPQ is 156cm².Then the area of the shadow part is（　　）（英汉词典：square正方形；thombus菱形）

A. 23cm²
B. 33cm²
C. 43cm²
D. 53cm²

延长PQ到AB于一点M，
∵正方形面积为169cm²，
∴AB=BC=13cm，
∵菱形QBCP的面积为：156cm²，
∴菱形边长BC=PC=13，
∴△MBQ≌△PCN，
正方形面积169cm²减去菱形QBCP的面积156cm²为13cm²，
∴矩形AMND面积为13，
∵AD=13，∴AM=1，
BM=12，BQ=13，
∴MQ=5，
∴S_△BMQ=5×12÷2=30，
∴阴影部分面积为：30+13=43cm²．
故选C．

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