1．Six rectangles each with a common base width of 2 have lengths of 1，4，9，16，25，and 36.What is the sum of the areas of the six rectangles？（　?。?br />六個(gè)矩形都有一個(gè)公共的底邊寬度為2，它們的長(zhǎng)度分別為1、4、9、16、25和36。這六個(gè)矩形的面積總和是多少？（　?。?/div>

2．Rectangles R₁ and R₂，and squares S₁，S₂ and S₃ shown below,combine to form a rectangle that is 3322 units wide and 2020 units high.What is the side length of S_2?in units？（　?。?br />如下圖所示，矩形R₁和R₂以及正方形S₁、S₂和S₃組合成一個(gè)寬3322單位、高2020單位的矩形。S₂的邊長(zhǎng)是多少單位？（　?。?br />

3．Point O is the center of the regular octagon ABCDEFGH，and X is the mid-point of side AB.What fraction of the area of the octagon is shaded？（　　）
點(diǎn)O是正八邊形ABCDEFGH的中心，X是邊AB的中點(diǎn)。陰影部分占八邊形面積比為多少？（　?。?/div>