a perfectly round shape
Look at the circles.

to give something a pigment, paint, or dye
Imagine seeing your favorite celebrity’s face made out of colored candies!

a precious gem
Her husband gave her diamond earrings for her birthday

increase by adding
Mary’s cookies, plus Ben’s cookies, plus Sam’s cookies added up to 272 cookies.

a shape in which one pair of lines is longer than the other pair
A student answered, "A regular cake is bigger, and it is shaped like a rectangle."

an open area in the center of a town
Our favorite place in the city is this square.

a mass of burning gas in space that looks like a point of light in the sky at night
stars are giant gas balls.

triangle
Look at the triangles.