基本的な名詞 - 形状

a completely round, plain shape

円

a shape with four equal straight sides and four right angles, each measuring 90°

正方形

(geometry) a flat shape consisting of three straight sides and three angles

三角形

(geometry) a flat shape with four right angles, especially one with opposing sides that are equal and parallel to each other

長方形, 長方形の

a shape that is wide in the middle and narrow at both ends

オーバル, 楕円

a shape with four equal, sloping straight sides, forming a point at the top and another at the bottom

ひし形, ダイヤモンド

a shape with five or more points, representing a star in the sky

星

(geometry) a round object that every point on its surface has the same distance from its center

球, スフィア

a figure, either hollow or solid, with six equal square sides

立方体

(geometry) a solid or hollow shape with two circular bases at each end and straight parallel sides

円柱

(geometry) a three dimensional shape with a circular base that rises to a single point

円錐

a solid object with a square base and four triangular sides joined to a point on the top

ピラミッド

a three-dimensional geometric shape with six rectangular faces, resembling a box or a rectangular prism

直方体, 長方形のプリズム

either half of a sphere

半球

(geometry) a solid figure with flat sides and two parallel ends of the same size and shape

プリズム

(geometry) any flat shape with four straight sides, the opposite sides of which are equal and parallel to each other

平行四辺形

(geometry) a flat shape with four flat sides, two of which are parallel

台形

a curved shape with narrow points at the ends that appears wider in the middle, like the shape of the moon in its first and last quarters

三日月, クレセント

a mark or an object formed by two short lines or pieces crossing each other

クロス

(geometry) a curved shape or design that gradually winds around a center or axis

スパイラル

a four-sided shape with two pairs of equal-length adjacent sides

ひし形, 凧

a flat geometric shape consisting of three straight sides and one right angle

直角三角形, 直角を持つ三角形

(geometry) a figure with four sides and two opposite angles more than 90° and two of less than 90°

ひし形, ロゼンジ

(geometry) a round 3D shape like a ball that is slightly flattened at the top and bottom points

球体, 楕円体

any half of a circle

半円

a geometric shape with five angles and five straight sides

五角形

(geometry) a closed shape with six straight sides and six angles

六角形

a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles

七角形

(geometry) a polygon consisting of eight straight sides and eight angles

八角形

(geometry) a flat shape consisting of nine straight sides and nine angles

九角形

(geometry) a flat polygon with ten straight sides and ten angles

十角形

a five-pointed star

ペンタグラム, 五芒星

(geometry) a flat star-shaped figure with six points that can be formed by making equilateral triangles on each side of a regular hexagon

ヘキサグラム, 六角星

(geometry) a shape that consists of a line alternating its direction to left and right

ジグザグ, ジグザグ（幾何学的に）

(geometry) a flat figure consisting of eleven straight sides and eleven angles

ヘンデカゴン

(geometry) a flat figure that consists of twelve sides and twelve angles

十二角形

a polygon with thirteen sides and thirteen angles

13角形

a rectangular figure that has unequal adjacent sides with arched angles

オブロング,長方形, round-edged rectangle

a solid shape resembling a donut or ring, made by spinning a circle around a line that does not cut through the circle

トーラス, リング

a line or shape that is not straight and bends gradually

曲線, アーク

(mathematics) any of the pair of geometric figures such as lines or planes which do not meet or intersect

平行線

(geometry) a closed plane curve that has two focal points

楕円