### Learning Math and Coding with Robots

 Grid: Tics Lines: Width px Hash Lines: Width px Labels: Font px Trace Lines: Robot 1: Width px Robot 2: Width px Robot 3: Width px Robot 4: Width px
 Axes: x-axis y-axis Show Grid Grid: 24x24 inches 36x36 inches 72x72 inches 96x96 inches 192x192 inches Quad: 4 quadrants 1 quadrant Hardware Units: US Customary Metric
 Background:

#### Robot 1

 Initial Position: ( in, in) Initial Angle: deg Current Position: (0 in, 0 in) Current Angle: 90 deg Wheel Radius: 1.75 in1.625 in2.0 in Track Width: in

#### Robot 2

 Initial Position: ( in, in) Initial Angle: deg Current Position: (6 in, 0 in) Current Angle: 90 deg Wheel Radius: 1.75 in1.625 in2.0 in Track Width: in

#### Robot 3

 Initial Position: ( in, in) Initial Angle: deg Current Position: (12 in, 0 in) Current Angle: 90 deg Wheel Radius: 1.75 in1.625 in2.0 in Track Width: in

#### Robot 4

 Initial Position: ( in, in) Initial Angle: deg Current Position: (18 in, 0 in) Current Angle: 90 deg Wheel Radius: 1.75 in1.625 in2.0 in Track Width: in

Animate a Ring
Problem Statement:
The pre-placed blocks animate the ring increasing and decreasing in size. Experiment with the code blocks and see what each part of the code does. Try slowing down the animation.
/* Code generated by RoboBlockly v2.0 */
#include <chplot.h>
double i;
double j;
CPlot plot;

plot.grid(PLOT_OFF);
plot.backgroundColor("white");
// we use the loop to create the animation
// the i loop is responsible for the first half
// the radius of the white circle decreases
// every time it loops
// change the "count i by 3"
// to change the speed of the animation
for(i = 1; i <= 16; i++) {
plot.strokeColor("red");
plot.fillColor("red");
plot.circle(18, 18, 16);
plot.strokeColor("white");
plot.fillColor("white");
plot.circle(18, 18, 16 - i);
// without delay, you can't see the animation
delaySeconds(0.03);
}
// the j loop decreases the size of the red ring
// by increasing the radius of the white circle
for(j = 1; j <= 16; j++) {
plot.strokeColor("red");
plot.fillColor("red");
plot.circle(18, 18, 16);
plot.strokeColor("white");
plot.fillColor("white");
plot.circle(18, 18, j);
delaySeconds(0.03);
}
plot.backgroundColor("white");

plot.label(PLOT_AXIS_XY, "");
plot.grid(PLOT_OFF);
plot.tics(PLOT_AXIS_XY, PLOT_OFF);
plot.axis(PLOT_AXIS_XY, PLOT_OFF);
plot.axisRange(PLOT_AXIS_XY, 0, 36);
plot.ticsRange(PLOT_AXIS_XY, 6);
plot.sizeRatio(1);
plot.plotting();
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Problem Statement:
The pre-placed blocks animate the ring increasing and decreasing in size. Experiment with the code blocks and see what each part of the code does. Try slowing down the animation.

Time