Lines, Angles and Shapes 14 July 2019 Here are some facts about angles that you should know A square corner like this is called a: RIGHT ANGLE It measures 900 (90 degrees) 900

1800 on a straight line Push Push 900 900 Push Push 900 900 900 + 900 = 1800 1800 on a straight line

b d a c Prove that x + y + z = 1800 y x z Line ab is parallel to line cd so… c

This angle must be x degrees y x z x This angle must be x degrees Line ab is parallel to line cd so c

This angle must be y degrees These are scissor angles so d y x z x c

This angle must be y degrees x z x These lines make corresponding angles so c

y d y y x z x x, y and z make a straight line so these angles must add up to give a total of 1800 c