People have names. And we give names to different kinds of animals. So why shouldn't angles have names? They do! Angles are named after the kind of corner they make. An angle that forms a square...
Dot-picture shapes.
You've probably made dot pictures lots of times. They're pictures you make by drawing lines from one dot to another. Well, here are some special dot pictures you can make for yourself. Get a paper...
Points and lines
What is this • ? You probably said, "It's a dot." Or maybe you said, "It's a period." Well, it could be a dot or a period. But to mathematicians, it's a picture of a point. You probably think of a...
Shapes everywhere
Just as you live in a world of numbers, you also live in a world of shapes. Your house or apartment is full of shapes. Every corner forms a shape called an angle. Every door and doorway is a shape...
Points, lines, shapes, and designs
Start with two points. Connect them with a line. Then make an angle (You're doing fine). Close the angle And a triangle's there. Put two triangles together ---You've got a square! And squares and...
Measuring mountains
> Have you ever wondered how people measure the height of a mountain? > They don't do it by climbing the mountain and measuring with a ruler > as they go! The height of a mountain is found by...
Measuring temperature
For thousands of years, people judged the temperature by how they felt. To check the heat of an oven, cooks put a hand into the oven. If the weather felt cold, people put on more clothes. Long, long...
Measuring speed
The mighty Superman can move faster than a speeding bullet---but how fast is that? A tiny snail creeps along at what is called a "snail's pace"---but how slow is that? There's an easy way to measure...
Minutes, seconds, and nanoseconds
> Atop a tower in the town square hung a big bell. At each side of the > bell was a large iron statue of a man. Each statue held a hammer in > its hands. > > Suddenly, one of the statues seemed to...
Water clocks and sand clocks
Measuring time by the sun or the stars is all very well, but people soon needed a better way. And this need led to the invention of the water clock. The first water clock was just a large clay or...