Java

Write an applet that will calculate the perimeter and area of certain

types of triangles and draw them.  The user will be prompted to

indicate which type of triangle to work with.  Types are right

triangle, isosceles triangle, and equilateral triangle.  The user will

input R or right to mean right triangle, I or isoceles to mean

isosceles triangle, or E or equilateral to mean equilateral triangle.

For a right triangle the user will then enter the lengths of the two

non-hypotenuse sides. 

For an isosceles triangle the user will then enter the length of the

base and the length of a side (which equals the length of the other

side).

For an equilateral triangle the user will then enter the length of a

side (which equals the length of the other two sides).

The program must check that no length is less than or equal to zero.

Also, for the isosceles triangle the base must be less than the

sum of the two sides.

Perimeter of any triangle is the sum of the lengths of all three sides.

Area of any triangle is (1/2)bh, where b is the base and h is the

height. 

In a right triangle, either non-hypotenuse side can be the base and

the other the height.

In an isosceles triangle, the height is:

square root of (side squared minus (base squared divided by 4))

In an equilateral triangle, the height is:

((square root of 3) divided by 2) times side

Draw the triangle in the paint method. 

Hints:

Right triangle: (x,y)

go up:        (x,y-s1)

go right:     (x+s2,y)

Isosceles: (x,y)

go up:   (x+b/2,y-h)

go right:(x+b,y)

Equilateral (special case of Isoclese, b=s)

           (x,y)

go up:   (x+s/2,y-h)

go right:(x+s,y)