---

All answers having "Branch of mathematics" as clue:

3 Character Answers:

---

ARC



4 Character Answers:

---

WEED



5 Character Answers:

---

LOGIC



7 Character Answers:

---

ALGEBRA

DESSERT



8 Character Answers:

---

CALCULUS

DELETING

GEOMETRY



10 Character Answers:

---

ARITHMETIC



12 Character Answers:

---

TRIGONOMETRY