rectangular

"Clouds were forming interesting shapes in the sky. "

"Her mother's illness changed the shape of their family life. "

"The children were excited to go to their classroom in the morning. "

"My daughter's teacher is very kind and helpful. "

"the angle between lines A and B"

"I have a house and a car."

"Electrical diagrams show device interconnections."

"The corners of the wire mesh were reinforced with little blobs of solder."

"The teacher wrote the math problem on the whiteboard so the students could see it clearly. "

"My brother is a different person; he's an other, not like me at all. "

"The picture frame is a rectangle. "

"The perfect tense, used to describe actions completed before another time, is a useful grammatical tool. "