2. The base of the trapezoid is15cm. A section of the upper bottom is extended by 6cm to become a parallelogram, and the area will become 30cm. What is the area of the original trapezoid? ?
3. A 30-meter-long fence forms a right-angled trapezoid along the wall, with a 5-meter-long fence side and an 8.4-meter hypotenuse on the opposite side. What is the area of this vegetable field? ?
The circumference of the rectangle is 48m, and the length-width ratio is 5:3. What is the area of this rectangle?
5. The rectangle is 8 cm long and 4 cm wide. Draw the largest semicircle in the rectangle. What is the area of this semicircle? What's the circumference? What percentage of a rectangle does it occupy?
6. Draw 16 small circles in a square with a side length of 4cm. /kloc-What is the sum of the areas of 0/6 small circles?
I really can't think of it, thank you!