Check for Mistakes in this Word Problem: circle-area

Directions: Write a function that returns the area of a circle given its diameter.

Contract and Purpose Statement

Every contract has three parts ...

;circle-area:number→number

; Takes the diameter of a circle and calculates the area by multiplying the square of the radius by pi.

Examples

Write some examples, then circle and label what changes ...

(EXAMPLE (circle-area10)(* (sqr (/ 10 2)) pi)

(EXAMPLE (circle-area50)(* (sqr (/ 50 2)) pi)

Definition

Write the definition, giving variable names to all your input values ...

(define (areadiameter)(* (sqr diameter) pi))