I’m pretty sure it’s 240 because you multiply then add
Patterns allow someone to make educated guesses.
If you were to think of this diagram as a map of intersecting roads, corresponding angles are the ones on the same corner:
NW corner: ∠1 and ∠3
NE corner: ∠5 and ∠7
SE corner: ∠6 and ∠8
SW corner: ∠2 and ∠4
The choices in bold font above are the only pairs of corresponding angles that are in your answer list:
- ∠1 and ∠3
- ∠5 and ∠7
- ∠6 and ∠8
Commutative Property of Multiplication.