A triangle is a plane figure with three sides.

三角形是有三个边的平面图形。

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A septilateral shape is a plane figure with seven sides.

七边形是在一个平面上有七个边。

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A line segment forming part of the perimeter of a plane figure.

形成一个平面图形的边界的线段。

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Investigators will try to figure out why the plane made such a steep descent into the home and whether the weather conditions -- light rain and low clouds -- played any role, he said.

CNN: Florida plane crash survivor: 'God is good'

Obama also called for "a review to ... figure out why an individual with the chemical explosive he had on him could get on a plane in Amsterdam and fly into the United States, " Gibbs said on NBC.

CNN: Obama orders review of flight screenings