### 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 an Hourglass
Problem Statement:
The pre-placed blocks will draw the outline of the hourglass with two triangles. They also will show the sand inside with a black triangle on the top half, and a black trapezoid on the bottom. Your task is to animate the hourglass so it begins with all the sand on the top and ends with all the sand sitting on the bottom.
```/* Code generated by RoboBlockly v2.0 */
#include <chplot.h>
double i;
double y;
double x;
double x2;
double yBot;
double xBot1;
double xBot2;
CPlot plot;

plot.grid(PLOT_OFF);
for(i = 1; i <= 6; i += 0.25) {
plot.backgroundColor("#c0c0c0");
plot.strokeColor("black");
plot.fillColor("white");
plot.triangle(12, 6, 18, 18, 24, 6);
plot.triangle(12, 30, 18, 18, 24, 30);
plot.fillColor("black");
y = 24 - i;
x = (y - 54) * -0.5;
x2 = (y + 18) * 0.5;
plot.triangle(x, y, 18, 18, x2, y);
yBot = 6 + i * 0.25;
xBot1 = (yBot + 18) * 0.5;
xBot2 = (yBot - 54) * -0.5;
plot.quad(12, 6, 24, 6, xBot2, yBot, xBot1, yBot);
delaySeconds(0.03);
}

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();```
 Blocks Save Blocks Load Blocks Show Ch Save Ch Workspace
Problem Statement:
The pre-placed blocks will draw the outline of the hourglass with two triangles. They also will show the sand inside with a black triangle on the top half, and a black trapezoid on the bottom. Your task is to animate the hourglass so it begins with all the sand on the top and ends with all the sand sitting on the bottom.

Time