Area of _____ equals half the product of its diagonal.
1). Parallelogram
2). Rectangle
3). Kite
4). Cyclic quadrilateral
1. Each edge of a regular tetrahedron is 3 cm,then its volume is
3. Find the area of the rhombus one side of which measures 25 cm and one diagonal is 30 cm?
6. Find the perimeter (in cm) of a semicircle of radius 7 cm.
9. A park is square shape with side 10 m. Find the area of the pavement 2 m wide to be laid within it.
10. The perimeter of a semi-circular area is 18cm, then the radius is : ( using $\pi$ = $\frac{22}{7}$)