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AMC8 1990

AMC8 1990 · Q15

AMC8 1990 · Q15. It mainly tests Area & perimeter, 3D geometry (volume).

The area of this figure is 100 cm². Its perimeter is
这个图形的面积是100 cm²。其周长是
stem
(A) 20 cm 20 cm
(B) 25 cm 25 cm
(C) 30 cm 30 cm
(D) 40 cm 40 cm
(E) 50 cm 50 cm
Answer
Correct choice: (E)
正确答案：（E）
Solution
Four squares total 100 cm², each 25 cm², side 5 cm, perimeter 10×5=50 cm.
四个正方形总面积100 cm²，每个25 cm²，边长5 cm，周长10×5=50 cm。
Topics
GE.007 Area & perimeter GE.013 3D geometry (volume)
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