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Perimeter is the area around something. In this photo it's showing the area around the building.

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The pencil is showing a line segment because it has to ends to create a line with 2 end points.

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In this photo its showing parallel lines because the two lines above and below the words wont intersect so they're parallel.

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These 2 triangles are congruent because they have the same sides makes them congruent.

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The line down the middle makes this pizza a adjacent angle and are the same size.

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The line is cutting through the line and making 2 equal parts.

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A straight angle is a line that has nothing intersecting it. This ruler is a straight line with nothing intersecting it.

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The 4 sides that equal the same measurement with 4 points, so in this photo it shows a square.

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The pyramid shows a triangle because it has 3 points that come together to make a triangle.

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These lines that come together and not all sides equal the same, only the ones across. In this photo it shows that.

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A rectangle has 2 equal sides, the bottom and top sides are equal in the frame, and the left and right sides are equal.

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The hands in this photo are making a circle, a circle has no corners or points just like in this photo.

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The watermelon is less the 90 degrees so that makes it a acute angle.

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A right angle has a 90 degrees, in this photo it's showing 90 degrees to create a right angle.

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An obtuse angle is larger then 90 degrees, in this photo it's showing a fan with an obtuse angle.

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The line on the ceiling has lights attached to it showing that there are points on the same ine.

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Postulate 1-2: If two distinct lines intersect, then they intersect in exactly 1 point

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Postulate 1-2: If two distinct lines intersect, then they intersect in exactly 1 point

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It's showing the two chair legs intersecting at the same point.

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Postulate 1-3: If two distinct planes intersect, then they intersect in exactly 1 line

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Postulate 1-3: If two distinct planes intersect, then they intersect in exactly 1 line

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In this photo its showing two planes intersecting each other in a line.