1. circle (n)
A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
2. rectangle (n)
hình chữ nhật
A plane figure with four straight sides and four right angles, especially one with unequal adjacent sides, in contrast to a square.
3. triangle (n)
hình tam giác
A plane figure with three straight sides and three angles.
4. square (n)
A plane figure with four equal straight sides and four right angles.