Geometry
Proofs with Quadrilaterals
Lesson
We've just started our journey on constructing geometrical proofs using deductive reasoning.
We can use proofs to show that various angles have particular values or equivalences or as we will practice in this lesson, use proofs to verify relationships within quadrilaterals.
Examples
Question 1
Prove that $x$x and $y$y are complementary angles.
Question 2
Let $s$s be the sum of exterior angles in quadrilateral $BCEG$BCEG. By using the fact that the angle sum of a quadrilateral is $360^\circ$360°, show that $s=360$s=360
