Angles in parallel lines Rules for todays lesson

F Parallel lines are marked with arrows A We describe angles with 3 letters

B E D A E D C C A Find the missing angles in

N N B A Find the size of the unknown angle

Type your answer in the chat or just work it out in your book.

Challenge Find the size of the unknown angle

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Angles in parallel lines Rules for todays lesson Chat is ONLY for Maths discussion It is to be used for asking or answering questions only Students incorrectly using the chat function will be removed from the lesson, reported and contact will be made with your parent/guardian

F Parallel lines are marked with arrows A We describe angles with 3 letters EG: the marked angle is FGB or BGF G B C H D The traversal (meaning to E travel) crosses the parallel lines We describe lines with two letters EG: the green line is CD

F F A A B B C C D D E E F Corresponding angles equal A B C Alternate angles equal D E Co-interior angles add up to 1800

H F A a b A B 82 o C F 85 o C B D D G E E F F A A 89 o C 89 o B C 88 o D D E B E

B D A E C

B D E A C B D A E C

B D E A C B D A B D E C A E C

B E D A C B D A B D E C A B E D C A E C

B E D A E D C C A Find the missing angles in each of the shapes above What can you say about triangles ABC and CDE in both questions? B

N N B A Find the size of the unknown angle

Type your answer in the chat or just work it out in your book. Find the size of angle a ? a 74 o 124 o A: 56 o B: 50 o C: 130 o D: 74 o

Type your answer in the chat or just work it out in your book. Find the size of angle a ? 33 o 108 o 99 o A: 60 o B: 39 o C: 33 o D: 66 o

Type your answer in the chat or just work it out in your book. Find the size of angle a ? a 32 o 107 o A: 73 o B: 107 o C: 32 o D: 105 o

Type your answer in the chat or just work it out in your book. How many of the angles; b, c, d, e are ALWAYS equal to angle a? a b e c d A: 1 B: 2 C: 3 D: 4

Challenge Find the size of the unknown angle