12. Prove that if DABCD is a convex quadrilateral, then o (DABCD) < 360°. This is Venema exercise 4.6.1 which has a small hint in the back. Your proof should clearly note where being convex is utilized in the proof

Algebra & Trigonometry with Analytic Geometry
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ISBN:9781133382119
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Chapter3: Functions And Graphs
Section3.1: Rectangular Coordinate Systems
Problem 33E
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Definition 4.6.1. Let A, B, C, and D be four points, no three of which are collinear.
Suppose further that any two of the segments AB, BC, CD, and DA either have no point
in common or have only an endpoint in common. If those conditions are satisfied, then
the points A, B, C, and D determine a quadrilateral, which we will denote by DABCD.
The quadrilateral is the union of the four segments AB, BC, CD, and DA. The four
segments are called the sides of the quadrilateral and the points A, B, C, and D are called
the vertices of the quadrilateral. The sides AB and CD are called opposite sides of the
quadrilateral as are the sides BC and AD. Two quadrilaterals are congruent if there is a
correspondence between their vertices so that all four corresponding sides are congruent
and all four corresponding angles are congruent.
listed is important.
Notice that the order in which the vertices of a quadrilateral
In general, ABCD is a different quadrilateral from DACBD. In fact, there may not even
be a quadrilateral DAC BD since the segments AC and BD may intersect at an interior
point.
D
De
B.
Transcribed Image Text:Definition 4.6.1. Let A, B, C, and D be four points, no three of which are collinear. Suppose further that any two of the segments AB, BC, CD, and DA either have no point in common or have only an endpoint in common. If those conditions are satisfied, then the points A, B, C, and D determine a quadrilateral, which we will denote by DABCD. The quadrilateral is the union of the four segments AB, BC, CD, and DA. The four segments are called the sides of the quadrilateral and the points A, B, C, and D are called the vertices of the quadrilateral. The sides AB and CD are called opposite sides of the quadrilateral as are the sides BC and AD. Two quadrilaterals are congruent if there is a correspondence between their vertices so that all four corresponding sides are congruent and all four corresponding angles are congruent. listed is important. Notice that the order in which the vertices of a quadrilateral In general, ABCD is a different quadrilateral from DACBD. In fact, there may not even be a quadrilateral DAC BD since the segments AC and BD may intersect at an interior point. D De B.
e
12. Prove that if DABCD is a convex quadrilateral, then o(UABCD) < 360°. This is Venema exercise 4.6.1
which has a small hint in the back. Your proof should clearly note where being convex is utilized in the
proof
Transcribed Image Text:e 12. Prove that if DABCD is a convex quadrilateral, then o(UABCD) < 360°. This is Venema exercise 4.6.1 which has a small hint in the back. Your proof should clearly note where being convex is utilized in the proof
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