# What are two lines in the same plane that intersect at right angles?

When two lines intersect they define a plane, so that's the "same plane" they're in. When two lines intersect at right angles, they're called perpendicular or orthogonal.

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Two lines in the same plane that intersect at right angles are called perpendicular lines.

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Two lines in the same plane that intersect at right angles are called perpendicular lines.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- How to find the equation of the line which passes through the point of intersection of the lines 7x − 3y − 19 = 0 and 3x + 2y + 5 = 0, give that the line is parallel to the line with the equation y = 2x + 1?
- A triangle has corners at #(2 ,4 )#, #(8 ,6 )#, and #(7 ,1 )#. How far is the triangle's centroid from the origin?
- An isosceles triangle has sides A, B, and C with sides B and C being equal in length. If side A goes from #(7 ,5 )# to #(8 ,1 )# and the triangle's area is #15 #, what are the possible coordinates of the triangle's third corner?
- What is the distance between the planes #2x – 3y + 3z = 12# and #–6x + 9y – 9z = 27#?
- What is the perimeter of a triangle with corners at #(5 ,2 )#, #(9 ,7 )#, and #(1 ,4 )#?

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