2l + w l(2+w) 2(l + w) l + l + 2w 2l + 2w l + l + w + w 2l … Answer: (b) Two right angles can be supplementary. Answer. When two angles' measures add up to 180∘, the angles are calledsupplementary (to each other).Supplementary pairs can either be made up of two right angles, or one acute and one obtuse angle By Mark Ryan . (b) Two right angles can be supplementary. Vertical angles are always, by definition, congruent. Complementary angles are two angles that add up to 90°, or a right angle; two supplementary angles add up to 180°, or a straight angle. If Angles are 91° & 91° 91° + 91° = 182° ≠ 180° Since sum is not 180°, they are not supplementary Ex 5.1, 7 Can two angles be supplementary if both of them are: (iii) right? (ii) Can two right angles be supplementary? Supplementary add to 180° You can also think: "C" of Complementary is for "Corner" (a Right Angle), and "S" of Supplementary is for "Straight" (180° is a straight line) Or you can think: when you are right you get a compliment (sounds like complement) "supplement" (like a … Ex 5.1 Class 7 Maths Question 8. (iii) Can two adjacent angles be complementary? (vii) Can two right angles form a linear pair? So, two right angles are always supplementary to each other. Properties of Supplementary Angles. We know that If two angles are supplementary, their sum is 180°. (a) Two adjacent angles can be complementary. Then, sum of two right angles will be (90°+ 90°) = 180°. Supplementary angles have two properties: Only two angles can sum to 180 °-- three or more angles may sum to 180 ° or π radians, but they are not considered supplementary; The two angles must either both be right angles, or one must be an acute angle and the other an obtuse angle; Try It! Answer: yes. If both the angles are right angles. (iii) Since, right angle = 90° ∴ right angle + right angle = 90° + 90° = 180° Thus, two right angles are supplementary angles. Hence, we can say that two right angles are always supplementary … Thus, the two obtuse angles cannot be supplementary angles. This fact is important to keep in mind because many complementary and supplementary angles that you will be dealing with in geometry are adjacent angles. (d) One obtuse angle and one acute angle cannot be supplementary. (d) Two right angles cannot be adjacent angles. We know that measure of a right angle is equal to 90°. (vi) Can an acute angle be adjacent to an obtuse angle? Is its complementary angle greater than 45° or equal to 45° or less than 45 °? 1. Solution: Answer. Note: If the two vertical angles are right angles then they are both congruent and supplementary. (v) Can two obtuse angles be adjacent? (c) Two obtuse angles can be supplementary. 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