### 5. The sides of a right-angled triangle are 12 cm, 16 cm, 20 cm respectively. A new right angle ? is made by joining the midpoints of all the sides. This process continues for infinite then calculate the sum of the areas of all the triangles so made.

### 6. The perimeter of a rectangle whose length is 6 m more than its breadth is 84 m. What will be the area of the rectangle?

### 7. The length and the breadth of rectangular field are in the ratio of 8 : 7. If charges of the painting the boundary of rectangle is at Rs. 10 per meter is Rs. 3000. What is the area of rectangular plot?

### 8. Find the area of the square whose side is equal to the diagonal of a rectangle of length 3 cm and breadth 4 cm.