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.
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.
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