The two lines on the left intersect each other at a right angle, which is 90 degrees.
左边的两条线以直角相交，也就是90度。
The two lines on the right are parallel, which means they never cross.
右边的两条线是平行的，这意味着它们永远不会相交。
The adjacent sides of a rectangle are perpendicular, which means they meet at a 90 degree angle.
矩形的邻边是垂直的，也就是说它们以90度角相交。
The opposite sides of a rectangle are equal and parallel, which means they never cross.
矩形的对边相等且平行，这意味着它们永远不会相交。
The area of a rectangle is the length times the width.
长方形的面积等于长乘以宽。
A circle is a two dimensional figure with a radius and circumference, which is the distance around the circle.
圆是一个具有半径和周长的二维图形，也就是绕圆的距离。
The area of a circle is PI R squared, well, R is the radius and PI is the ratio of a circle circumference to its diameter.
圆的面积是R方，R是半径是圆的周长和直径的比值。
A sphere is a three dimensional figure with a radius and a volume, which is 4/3 PI R cubed.
球是一个三维图形，半径和体积，是4/3 R³。
All points on the surface of a sphere are equidistant from its center.
球面上的所有点离圆心的距离都相等。
A right triangle is a two dimensional figure with 3 sides, two of which are perpendicular.
直角三角形是一个二维图形，有三条边，其中两条是垂直的。
To find its area, multiply the length of the two perpendicular sides, A & B, and divided by two, A equals one half A B.
要找到它的面积，乘以两条垂直的边A和B的长度，然后除以2,A等于1 / 2ab。
A rectangle is a two dimensional figure with 4 sides.
长方形是有四条边的二维图形。
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