# Exercises

### Compilation Target

Create a line drawing of an archery target with three concentric scoring bands, as shown in Figure pictures:target1. For bonus credit add a stand so we can place the target on a range, as shown in Figure pictures:target2. <div class="solution"> The simplest solution is to create three concentric circles using the `on` method:

``````Image
.circle(20)
.on(Image.circle(40))
.on(Image.circle(60))``````

For the extra credit we can create a stand using two rectangles:

``````Image
.circle(20)
.on(Image.circle(40))
.on(Image.circle(60))
.above(Image.rectangle(6, 20))
.above(Image.rectangle(20, 6))``````

</div>

### Stay on Target

Colour your target red and white, the stand in brown (if applicable), and some ground in green. See Figure pictures:target3 for an example. <div class="solution"> The trick here is using parentheses to control the order of composition. The `fillColor()`, `strokeColor()`, and `strokeWidth()` methods apply to a single image---we need to make sure that image comprises the correct set of shapes:

``````Image
.circle(20).fillColor(Color.red)
.on(Image.circle(40).fillColor(Color.white))
.on(Image.circle(60).fillColor(Color.red))
.above(Image.rectangle(6, 20).fillColor(Color.brown))
.above(Image.rectangle(20, 6).fillColor(Color.brown))
.above(Image.rectangle(80, 25).noStroke.fillColor(Color.green))``````

</div>

Images→