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answered • expert verified Advertisement Advertisement Brainly User Brainly User ANSWER: C. Two angles are supplementary A. B. D. are proven that a quadrilateral is a parallelogram. ^_^ Advertisement Advertisement New questions in MathFInd the slope of the line that passes through (0,-6) and (4,0). The school cafeteria serves muffins every sixth days and cheeseburgers every eight days. If tacos and cheeseburgers are both in today's menu, how many … days will it be before they are both in the menu again?. How to change dissimilar fraction to similar fraction?. What animal has a bird-like bill and lays egg but is not a bird? Athena walks 2. 3 km on Monday, 1. 9 km on Tuesday, 2. 6 km on Wednesday, 3. 2 km on Thursday and 3. 5 km on Friday. What is the average distance she … walked in 5 days?.
Previous Next Advertisement If both pairs of opposite sides of a quadrilateral are parallel, then it’s a parallelogram (reverse of the definition). If both pairs of opposite sides of a quadrilateral are congruent, then it’s a parallelogram (converse of a property). Tip:To get a feel for why this proof method works, take two toothpicks and two pens or pencils of the same length and put them all together tip-to-tip; create a closed figure, with the toothpicks opposite each other.
The only shape you can make is a parallelogram. If both pairs of opposite angles of a quadrilateral are congruent, then it’s a parallelogram (converse of a property). If the diagonals of a quadrilateral bisect each other, then it’s a parallelogram (converse of a property). Tip: Take, say, a pencil and a toothpick (or two pens or pencils of different lengths) and make them cross each other at their midpoints. No matter how you change the
angle they make, their tips form a parallelogram. If one pair of opposite sides of a quadrilateral are both parallel and congruent, then it’s a parallelogram (neither the reverse of the definition nor the converse of a property). Tip: Take two pens or pencils of the same length, holding one in each hand. If you keep them parallel, no matter how you move them around, you can see that their four ends form a parallelogram. About This ArticleThis article is from the book:
About the book author:Mark Ryan is the founder and owner of The Math Center in the Chicago area, where he provides tutoring in all math subjects as well as test preparation. Mark is the author of Calculus For Dummies, Calculus Workbook For Dummies, and Geometry Workbook For Dummies. This article can be found in the category:
Transcribed Image Text:3. Which of the following conditions is not sufficient to prove that a quadrilateral is a parallelogram? A. Two pairs of sides are parallel. B. Two pairs of opposite sides are congruent. C. Two angles are supplementary. D. Two diagonals bisect each other. 4. What is true about the diagonals of a parallelogram? A. They are always congruent. B. They are always perpendicular. C. They always bisect each other. D. They always form four congruent angles. 5. Which of these statements is not true about parallelograms? A. Parallelograms are always quadrilateral. B. Opposite angles of a parallelogram are always supplementary. C. Diagonals of a parallelogram always intersect at a point. D. Opposite sides of a parallelogram are always parallel. Q: Jamal and Alex spent 3 hours canoeing on a stream. They went 5 miles upstream and then 5 miles back ... A: Click to see the answer Q: 5x 2. ,2 x² - 9 X+4 8. 4. 3x+9 x² +3x 2. A: Rational function is defined where denominator never zero. Q: Math Journal: Case of the Cooling Corpse The following is a synopsis of the first part of an unpubli... A: Click to see the answer Q: Use the difference an+1 an to show that the sequence {n – 11"} is strictly increasing or strictly de... A: Click to see the answer Q: x* + 5х 5. Зх + x² - 2 3x3y3 4xy :- y-x 7. X-y A: Click to see the answer Q: In the year 2003, a person bought a new car for $12500. For each consecutive year after that, the va... A: Click to see the answer Q: f(x) = 8x+24. Show function for the inverse A: Click to see the answer Q: Show that lGl =20 , so G is not simple A: Click to see the answer Q: plve the problem by using the problem-solving flowchart. The Green Bay Packers won the game with 7 p... A: Let the points scored by Green bay packers is x andthe points scored by kansas city chefs is yPoints... Q: Find a set of vectors {u, v} in Rª that spans the solution set of the equations w – x + 2y – 4z 0, 4... A: The detailed solution is given below Thank you Q: Theresa borrowed $3226.00 compounded annually to help finance her education She contracted to repay ... A: To solve the following problem Q: Determine whether the matrix is symmetric, skew-symmetric, or neither. A square matrix is called ske... A: Click to see the answer Q: Determine the effective annual yield for $1 invested for 1 year at 4.6% compounded quarterly. A: Click to see the answer Q: 5. In a complete sentence, describe the relevant angle relationships in the following diagram. Find ... A: We know opposite angles are equal. Q: What is the solution to 3x- 2x + 4 0 ? A: Click to see the answer Q: Write the equivalent fraction for x2 4 that has a denominator of (x + 2)(x – 2)(2æ + 3). a) 10x +3 (... A: Click to see the answer Q: /hich number line shows the solutions ton > -2? -6 -5 -4 -3 -2 -1 01 2 + -6 -5 -4 -3-2-1 0 12 34 S6 ... A: Click to see the answer Q: Terry's Car Rentals charges $20 per day plus 55c/km for the hire óf å small car. Complete the table ... A: Click to see the answer Q: i) -6(-4 + 2) – 2(-4 + 8) – 2(-3) = 2 a) 11/4 x 2 2/5 ÷ (11/4 + 21/12) = (b) After divi... A: As per Bartleby guidelines we can solve only one question at a time so the first question i.e 1.i) c... Q: Several students are going to ride their bikes from the city park to Lake Kegonsa, a distance of 25 ... A: Click to see the answer Q: Prove that if both products AB and BA are defined, then AB and BA are square matrices. Assume that A... A: We want to prove that AB and BA are square matrices Q: Simplify the given product below. (x + 1) (x + 2) O x² + 3x + 1 O x² + 4x + 2 O x² + 2 O x2 + 3x + 2 A: Click to see the answer Q: ich of the following is the value of y as y v A. y = 1/3 В. у- 1/2 C. y = 98 D. y = 1/4 A: We will find out the value of y. Q: Solve for x. Round to the nearest tenth, if necessary. 9.3 60° M A: Click to see the answer
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Which of the following is not a condition that a quadrilateral is a parallelogram?Answer and Explanation:
Indicating that the two opposite sides are parallel is not a sure indicator of a parallelogram because a trapezoid has two opposite sides that are parallel but the remaining opposite sides are not.
What are the 4 conditions for a given quadrilateral to be a parallelogram?Both pairs of opposite sides are congruent. Both pairs of opposite angles are congruent. The diagonals bisect each other. One angle is supplementary to both its consecutive angles.
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Which of the following conditions is not sufficient to prove that a quadrilateral is a parallelogram
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