find the sum of two opposite angles of parallelogram is 140. find the all angles
Answers
Answer:
Menu
Geometry / Quadrilaterals /
Properties of parallelograms
One special kind of polygons is called a parallelogram. It is a quadrilateral where both pairs of opposite sides are parallel.
Parallelogram
There are six important properties of parallelograms to know:
Opposite sides are congruent (AB = DC).
Opposite angels are congruent (D = B).
Consecutive angles are supplementary (A + D = 180°).
If one angle is right, then all angles are right.
The diagonals of a parallelogram bisect each other.
Each diagonal of a parallelogram separates it into two congruent triangles.Parallelogram1
△ACD≅△ABC
If we have a parallelogram where all sides are congruent then we have what is called a rhombus. The properties of parallelograms can be applied on rhombi.
If we have a quadrilateral where one pair and only one pair of sides are parallel then we have what is called a trapezoid. The parallel sides are called bases while the nonparallel sides are called legs. If the legs are congruent we have what is called an isosceles trapezoid.
trapetzoid
In an isosceles trapezoid the diagonals are always congruent. The median of a trapezoid is parallel to the bases and is one-half of the sum of measures of the bases.
Trapezoid Median
EF=12(AD+BC)
Video lesson
Find the length of EF in the parallelogram
Share on Facebook
NEXT CHAPTER:
GEOMETRY – Transformations
Search
Search in Mathplanet
PRE-ALGEBRA
ALGEBRA 1
ALGEBRA 2
GEOMETRY
All courses
GEOMETRY
Overview
Points, Lines, Planes and Angles
Proof
Perpendicular and parallel
Triangles
Similarity
Right triangles and trigonometry
Quadrilaterals
GEOMETRY
QUADRILATERALS
Overview
Angles
Properties of parallelograms
About Mathplanet
Transformations
Circles
Area
SAT
ACT
Creative Commons-licens
Mathplanet is licensed by Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationell-licens.
Answer:
plzz give me brainliest ans and plzzzz follow me and give thanks
