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It is try to found length of sides on that polygon

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Only one polygon that doesn't have angles. D=2R around is 3.14xD and area is R(R)3.14

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The one of polygon that has three angles with three slides.This image I choose because this right triangle will be most people saw commonly.This right triangle's around is 3(B) and area is H(B)/2.

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Square is the only shape that has 4sides with same length. SO when we try to get around than it will be 4(S) and area will be S(S).

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The Rectangle is the now of type of the square and sometime base and high's length is

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Like a midpoint the Angle Bisector is dividing the angle by half.

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Supplementary Angles that also form a linear pair

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Supplementary Angles that also form a linear pair

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The two angles from a measurement angles 180

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When we add two measure of angles must me 90 must be+ no - or x or /

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Adjacent angles refers to a pair of angles that share a common vertex (point where angles meet) and side yet don't overlap.

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Even the way looking is different the measure of angle is equal so two angles are have same measure.

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When lines are crossing than measure of opposite sides angles are congruent.

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The measure of angle is must be 180

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The measure of angles are 90.11... to 179.99...

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The measure of angle is 90.0

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The measure of angle is 1~89.99...

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Segment Bisector is the line or segment of midpoint. the segment crossing the other line on the middle of the line by one point.

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When any line or segment are there than Midpoint is must be one the middle of that so left and right side of that points must be have same distance.

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The congruent mean similar or same so Congruent Segments mean there is two same segment are there.

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

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

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Similar like postulate 1-2 if two plane meet than most will be meet by segment.

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

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

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If two lines or segments are meet than it must be one of point except if those lines are parallel so when it be one line

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The segment is one of types of line but the segment has limit by two end points so we can write by number

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Line is the infinity of segments are include there but we can only think straight line but there is lots of kinds of lines are there and when we points 2 on line it have distance that we can write by number but not to line.

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Collinear Points is the over 3 points are in one line so on the image the A,B,D are on one line but C are out of line it is also in same planar but not on same line so only A,B,D are Collinear Points

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This is coplanar points it mean the points that over 2 are in the same 2d planar. this image is most good example of coplanar points I think

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Plane is a thing that include the polygons and the 2nd dimension word. Also reason I choose this image because try to show lots of example of plane.

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It has no size i.e. no width, no length and no depth, and it is a mark of where is and reason I choose this image because this picture are made by lots of dots.