Geometry

The two lines on the left intersect each other at a right angle, which is 90 degrees.√

The two lines on the right are parallel, which means they never cross.√

The adjacent sides of a rectangle are perpendicular, which means they meet at a 90-degree angle.√

The opposite sides of a rectangle are equal and parallel, which means they never cross.√

The area of a rectangle is the length times the width.√

A circle is a two dimensional figure with a radius and circumference , which is the distance around the circle.√

The area of a circle is pi r squared, where r is the radius and pi is the ratio of a circle's circumference to its diameter.√

A sphere is a three dimensional figure with a radius and a volume, which is 4/3 pi r cubed.

All points on the surface of a sphere are equidistant from its center.

A right triangle is a two dimensional figure with 3 sides, two of which are perpendicular.√

To find its area, multiply the lengths of the two perpendicular sides, a and b, and divided by two. A = 1/2 ab.

The two lines on the right are parallel, which means they never cross.

All points on the surface of a sphere are equidistant from its center.

These lines are parallel, which means they never cross.

听选Which two lines intersect at a right angle? -These two lines intersect each other at a right angle, which is 90 degrees.

听选which two dimensional figure has a radius and circumference? -A circle is a two dimensional figure with a radius and circumference, which is the distance around the circle.

听选Which figured area - The area of a circle is pi r squared, where r is the radius and pi is the ratio of a circle's circumference to its diameter.

听选Which two dimensional figure has four sides? - A rectangle is a two dimensional figure has four sides.

听选Which three dimensional figure has a volume which is 4/3 pi r cubed? - A sphere is a three dimensional figurewith a radius and a volume, which is 4/3 pi r cubed.

听选Which two dimensional figure has three sides? -A right triangle is a two dimensional figure with 3 sides, two of which are perpendicular.

填空The two lines on the right are parallel, which means they never cross.

填空Pi is the ratio of a circle's circumference to its diameter.

听说The area of a rectangle is the length times the width.（81）

听说Pi is the ratio of a circle's circumference to its diameter.（83）

A right triangle is a two dimensional figure with 3 sides, two of which are perpendicular.

The two lines on the left intersect each other at a right angle, which is 90 degrees.

填空The opposite sides of a rectangle are equal and parallel, which means they never cross.

A rectangle is a two dimensional figure has four sides.

听说Pi is the ratio of a circle's circumference to its diameter.（70）

看说A right triangle is a 2 dimensional figure with 3 sides, two of which are perpendicular. (79)

看说All points on the surface of a sphere are equidistant from its center.（77）

看说The opposite sides of a rectangle are equal and parallel, which means they never cross.（77）