Answer:

Explanation:
A pie has a circular form and each piece represents a circular arc. The angle of each piece is obtained by the division of the total angle by the number of pieces. Then:


The answer is option number 4. If you do the math, the sides are simply scaled by 3.
1. Use less water.
2. Thrift shop.
3. Use renewable energy
4. Compost
5. Recycle