Area of a Trapezoid | MathHelp.com - By MathHelp.com
Transcript
| 00:0-1 | In this example we're asked to find the area of | |
| 00:02 | the trapezoid shown . Remember that a trapezoid is a | |
| 00:06 | quadrilateral with one pair of parallel sides . The formula | |
| 00:12 | for the area of a trapezoid is area equals one | |
| 00:16 | half times parentheses . Base one plus base two times | |
| 00:23 | height . Where the bases are the parallel sides . | |
| 00:27 | So when the trapezoid shown , the bases are 15 | |
| 00:31 | and 25 and the height is 5" . Plugging this | |
| 00:36 | information into the formula . We have 1/2 Times 15 | |
| 00:43 | plus 25 times 5" . Yes . Next . The | |
| 00:52 | order of operations tells us that we must simplify inside | |
| 00:56 | the parentheses . 1st 15 plus 25 is 40" . | |
| 01:03 | Yeah . And we have one half times 40 times | |
| 01:08 | 5" . Yeah . 1/2 times 40 is 20" . | |
| 01:17 | Yeah . And we have 20 times five Which is | |
| 01:23 | 100 inches squared . So the area of the trapezoid | |
| 01:29 | shown is 100 sq in . |
Summarizer
DESCRIPTION:
This lesson covers the definition of a circle and the radius of a circle. Students learn the definitions of a circle, a radius, a chord, a diameter, a secant, a tangent, congruent circles, concentric circles, an inscribed circle, and a circumscribed circle. Students are then asked to identify or draw these figures in given problems.
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