Exercise one

That is what i made in coding

The code in that drawing is:

d'=small circle=3cm;
d''=big circle=4cm;

Algorithm:

2.7cm radius around the centre of a circle (equilateral triangle):
→↙↖ x1;

4.5cm radius around the centre of a circle  (isosceles triangle):
→↙↖ x1;

Repetition:

repeat one

↓x1
repeat two

↓x1
repeat

↓
rotate 90˚ on the left;
rotate 90˚ on the right;

Get that coding:

Repeat this repeatition 4 times but change into other three different position.

Finally get that coding: