Jess Calculator 1 is a mathematical calculator which has 4 buttons. It is a calculator which helps to get areas of a circle, rectangle and trapezium. It also helps in getting the distance using the speed and time.

1. Circle

The area of a circle is the number of square units inside that circle. If each square in the circle to the left has an area of 1 cm2, you could count the total number of squares to get the area of this circle. Thus, if there were a total of 28.26 squares, the area of this circle would be 28.26 cm2 However, it is easier to use one of the following formulas:

Area equals Pi times r squared space or space Area equals Pi times r times r            where Area is the area, and radius is the radius. 

                     

2. Rectangle

A rectangle is a square with 4 unequal sides. The first  2 sides are equal, the other 2 sides are equal. To find the area of a rectangle, multiply the length by the width. The formula is: 

A = L x W                              where A is the area, L is the length, W is the width, and · means multiply. 

                                             

3. Trapezium

A trapezium is a quadrilateral that has only one pair of parallel sides.

Consider the area of the following trapezium.

To calculate the area of a trapezium, divide it into a rectangle and two triangles as shown below.

Now, piece together the triangular ends so that the trapezium is divided into a triangle and rectangle.  The base of the triangle is the difference between the lengths of two parallel sides.  That is, a – b.

The area of the trapezium is given by the following formula where a and b are the lengths of the parallel sides and h is the perpendicular distance between the parallel sides:

             

  4. Distance

It is what separate two points. To reach a point from another point, the speed with which you move and the time that  you take are involved. 

The formula of the distance is : Distance = speed *time