Prove two triangles are congruent by showing they satisfy one of four criteria. Find missing lengths by using the scale factor. The relationship between similar shapes may be expressed as a ratio.

Tonight will start similarly, with cloudy conditions throughout. Cloud will break up from the west overnight, leaving clear spells by dawn. Wednesday Tomorrow will be a mostly bright and fine day.

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

Daniel Liberto is a journalist with over 10 years of experience working with publications such as the Financial Times, The Independent, and Investors Chronicle. Eric's career includes extensive work ...

You need an X-ray to measure your Cobb angle and find scoliosis. Scoliosis is diagnosed when the Cobb angle is 10 degrees or more. Surgery is considered when the Cobb angle reaches 40 to 50 degrees.