One Plus One Equals?

In this teaser you are required to find a word relating to mathematics hiding in consecutive letters within each sentence. Have fun!

Example:

"They knew that they had done the wrong thing."

Answer: ADD located in: "...hAD Done..."


1. He gave his pet serpent a gondola ride.

2. How did the koala cub end up with the kangaroo?

3. Did the kind entomologist pamper centipedes?

4. The scholarship includes tuition but does not cover textbooks.

crap! i just failed a math class!

but i'll work on this one

ETA: the third one is easy! Percent!! pamPER CENTipedes

Answer

1. PENTAGON (serPENT A GONdola)

2. CUBE (CUB End)

3. PERCENT (pamPER CENTipedes)

4. VERTEX (coVER TEXt)