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8.2 Parallelograms
HW pg. 518 #331 odds 1
January 04, 2012
Bellwork1. Find the sum of the measures of the interior angles of a convex 24-gon.
2. The sum of the measures of the interior angles of a convex polygon is 5040. Classify the polygon by the # of sides.
3. Find the measure of an interior angle and a exterior angle of a regular 36-gon.
3960
30-gon
170, 10
8.2 Parallelograms
HW pg. 518 #331 odds 2
January 04, 2012
Parallelogram: a quadrilateral with both pairs of opposite sides //
Theorem 8.3: If a quadrilateral is a //ogram, then its opposites are ≅
Theorem 8.4: If a quad is a //ogram, then its opposite <s are ≅
8.2 Parallelograms
8.2 Parallelograms
HW pg. 518 #331 odds 3
January 04, 2012
Theorem 8.5: If a quad is a //ogram, then its consecutive <s are supplementary.
x
y
y
x
x + y = 180
8.2 Parallelograms
HW pg. 518 #331 odds 4
January 04, 2012
Theorem 8.6: If a quad is a //ogram, then its diagonals bisect each other.
8.2 Parallelograms
HW pg. 518 #331 odds 5
January 04, 2012
8.2 HW pg. 518 #331 odds