A trapezoid is a quadrilateral with two parallel sides. In geometry, you may be asked to find a missing side of a trapezoid, given the area and height. For example: a trapezoid has an area of 171 cm^2, a side of 10 cm and a height of 18 cm. How long is the missing side? Finding it takes some basic principles of geometry and a splash of algebra.
Substitute the information given in the question to the formula for finding the area of a trapezoid (A=.5height (base1+base2)). 171=(.5)*18(10+base2).
Multiply out .5 by 18: 171= 9(10+base 2).
Use the distributive property to multiple out the equation: 171= 90+9(base 2).
Use algebra to solve the remainder of the problem. Subtract 90 from both sides: 81=9(base2), then divide each side by 9. 9=base 2.
Style Your World With Color
Barack Obama's signature color may bring presidential power to your wardrobe.View Article
See how the colors in your closet help determine your mood.View Article
Let your imagination run wild with these easy-to-pair colors.View Article
Let your clothes speak for themselves with this powerhouse hue.View Article