Construction – Angles – Relay Race In this competitive activity students work in teams to answer questions provided on small pieces of paper. Students should check their answers with the teacher (who can be anywhere in the room with their answer sheet). If students are correct they can collect the next numbered sheet (easily placed in piles face-up on a desk at the front). If students are wrong they can skip the question or be given 1 or more chances.

Printing To print handouts from slides - Select the slide from the left. Then click: File > Print > ‘Print Current Slide’ To print multiple slides - Click on a section title to highlight all those slides, or press ‘Ctrl’ at the same time as selecting slides to highlight more than one. Then click: File > Print > ‘Print Selection’ To print double-sided handouts - Highlight both slides before using ‘Print Selection’. Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

Constructing Angles with a Relay Race! Constructing Angles with a Ruler & Protractor

1 2 3 4 A A A B Construct a 60° angle using the base line below. Label the angle. 2 Construct a 130° angle at A on the base line below. Label the angle. A 3 On the base line below, construct an angle of 30° at A, and 70° at B. Join the lines so you have constructed a triangle. 4 Construct an angle of 210° at A. Label the angle. Label the angles. CTRL-Left Click slides to select. Go to Print > ‘Print Selection’ and choose the amount of copies you need (one per team). A A B

5 6 7 8 A A B Construct a 310° angle at A. Label the angle. Construct a triangle with angles of 20° and 70°. Use the base line below. Label the angles. Measure and label the third angle. A 7 Construct a triangle with angles of 30° at A and 120° at B. Use the base line below. Label the angles. Measure and label the third angle. 8 Create an isosceles triangle with one angle of 140°. The equal sides of the triangle should be 6 cm in length. What type of triangle is this? CTRL-Left Click slides to select. Go to Print > ‘Print Selection’ and choose the amount of copies you need (one per team). A B

9 10 11 12 108° Create an equilateral triangle with sides of 7 cm. Construct a parallelogram below with base angles of 35° and 145°. Use the base line below. The other sides should be 5 cm in length. 11 12 Construct a rhombus with 7 cm sides, one angle of 55° and one angle of 125°. Create a regular pentagon using the two sides below. CTRL-Left Click slides to select. Go to Print > ‘Print Selection’ and choose the amount of copies you need (one per team). 108°

1 Construct a 60° angle using the base line below. Label the angle. 2 Construct a 130° angle at A on the base line below. Label the angle. OR 60° 60° 130° A 3 On the base line below, construct an angle of 30° at A, and 70° at B. Join the lines so you have constructed a triangle. 4 Construct an angle of 210° at A. Label the angle. Answers Label the angles. CTRL-Left Click slides to select. Go to Print > ‘Print Selection’ and choose the amount of copies you need (one per team). 210° A 30° 70° A B

Answers 5 6 310° 90° 20° 70° 7 8 30° Isosceles 140° 120° 30° A A B Construct a 310° angle at A. Label the angle. 6 Construct a triangle with angles of 20° and 70°. Use the base line below. Label the angles. Measure and label the third angle. 310° 90° A 20° 70° 7 Construct a triangle with angles of 120° at A and 30° at B. Use the base line below. Label the angles. Measure and label the third angle. 8 Create an isosceles triangle with one angle of 140°. The equal sides of the triangle should be 6 cm in length. What type of triangle is this? CTRL-Left Click slides to select. Go to Print > ‘Print Selection’ and choose the amount of copies you need (one per team). 30° Isosceles 140° Answers 120° 30° A B

9 Create an equilateral triangle with sides of 7 cm. 10 Construct a parallelogram below with base angles of 35° and 145°. Use the base line below. The other sides should be 5 cm in length. 35° 145° 60° 8 cm 11 12 Construct a rhombus with 7 cm sides, one angle of 55° and one angle of 125°. Create a regular pentagon using the two sides below. Answers CTRL-Left Click slides to select. Go to Print > ‘Print Selection’ and choose the amount of copies you need (one per team). 55° 125° 108°

tom@goteachmaths.co.uk Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths.co.uk