In this lesson on circles, students will learn how to find the area and circumference of circles, semicircles, and compound shapes using formulas.
Find Pi (3.14) using Buffon's needle problem.
Gain an understanding of how to find the diameter of a circle by viewing an example and a video lesson. [1:01]
Students solidify their understanding of the terms "circumference" and "rotation" through the use of LEGO MINDSTORMS(TM) NXT robotics components. They measure the circumference of robot wheels to determine how far the robot can travel during one rotation of an NXT motor. They sharpen their metric system measurement skills by precisely recording the length of a wheel's circumference in centimeters, as well as fractions of centimeters. Through this activity, students practice brainstorming ways to solve a problem when presented with a given scenario, improve their ability to measure and record lengths to different degrees of precision, and become familiar with common geometric terms (such as perimeter and rotation).
This interactive exercise focuses on working with the radius of various circles to find the circumference and area as well as challenging you to find the distance a square wheel travels around the track.
Students learn that math is important in navigation and engineering. They learn about triangles and how they can help determine distances. Ancient land and sea navigators started with the most basic of navigation equations (speed x time = distance). Today, navigational satellites use equations that take into account the relative effects of space and time. However, even these high-tech wonders cannot be built without pure and simple math concepts â basic geometry and trigonometry â that have been used for thousands of years.
This video tutorial teaches you how to calculate the surface area and volume of cones. Just like pyramids and cylinders, there are formulas for surface area and volume of cones. Also included are questions on composite solids that consist of cones too. Step-by-step explanations are provided along with examples. [3:38]
Find a quick, concise explanation of circumference. The formula for finding the circumference of a circle is explained.
It's easy to find the circumference of a circle if you know the diameter. Just plug in its value into the formula for the circumference of a circle to get the answer. This tutorial shows you how. [3:28]
It's easy to find the circumference of a circle if you know the radius. Just plug the value for the radius into the formula and solve. This tutorial shows you how. [4:18]
Use the formula for the circumference of a circle to find the radius. This tutorial shows you how to use that formula and the given value for the circumference to find the radius. [3:43]
The circumference of a circle is the distance around that circle. Take a look at this tutorial to discover the formulas for the circumference of a circle. [4:22]