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### Grade 7 - Mathematics8.8 Rhombus

 Properties of Rhombus: The diagonals in a rhombus bisect each other. Each diagonal of a rhombus divides it into two congruent triangles. Opposite angles of a rhombus are equal and the sum of any two adjacent angles is 180°. In a rhombus the diagonals bisect each other at right angles, that is, the diagonals are perpendicular to each other and bisect each other. THEOREMS A quadrilateral is a rhombus, if and only if it has four congruent sides. AB @ BC @ CD @ DA A parallelogram is a rhombus, if and only if its diagonals are perpendicular AC ^ BD A parallelogram is a rhombus, if and only if each diagonal bisects a pair of opposite angles. Directions: Read the above review points carefully and answer the following questions: Explain the different theorems of a rhombus, in your own words, with examples. Illustrate each of the above review points by drawing different rhombus. If one of the angles of a rhombus is 2 times the adjacent angle, then what will be the value of the angle opposite to it? Give reasons. A side of a rhombus is given by 16 cm. What will be the value of half of the other side? Give reasons. Question: The diagonals of rhombus ABCD intersect at O. Given that measure of ÐBAC is 530 and DO = 8, Find the mÐABO, mÐABC, mÐBCO, mÐBCD, mÐCDO, mÐCDA, mÐAOB, mÐBOC, mÐAOD, AO, AC, BD (Hint: Use pythagorean theorem to find the measures of angles)
 Q 1: The diagonals of a rhombus bisect at __________.right anglesacute anglesobtuse angles Q 2: The length of each side of the rhombus shown is ____.3124 Q 3: One of the diagonals of a rhombus is given by 10 cm. Then it divides the rhombus into two __________.congruent triangleshalves is 5 cm eachperpendicular bisectors Q 4: The opposite sides of a rhombus are given by 6 cm, 6 cm and 8 cm. Then the third side will be __________.6 cm12 cm8 cm Q 5: A quadrilateral becomes a rhombus, when all its sides are equal.Falsetrue Q 6: The value of side DC if side AB is given by 12.5 cm, is __________.11 cm15 cm7.5 cm Q 7: The two adjacent angles of a rhombus have degree measures 60 and 30.FalseTrue Q 8: The diagonals of rhombus ABCD intersect at O. Given that measure of angle BAC is 530 and DO = 8, Find the measure of angle ABO. Answer: Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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