1. The picture on the left is a rectangular piece of paper. Please draw a line and divide it into two parts. After cutting along this line, these two parts can be combined into triangles, parallelograms and trapezoid. Please draw the figure you spelled.

2. The picture on the right is a rectangle with a length of 3 cm and a width of 2 cm. Draw a line segment in a rectangle, divide it into the largest isosceles right triangle and a trapezoid, and find the area of this trapezoid.

6. The radius of the semicircle is r and the circumference is () 7 12 8.

a、лR B、лR+2R C、2лR D、2лR+2R

7, just put five cans in the box, the bottom of each can.

The radius of this box is 3 cm, and the length of this box is () cm.

a、25 B、24 C、 15 D、30