Angles and Construction 1

5. Angles and Construction 1

by Maman Firmansyah

• ​use the fact that the sum of the angles around a point is 360°

• ​show and use the fact that the angles of any quadrilateral add up to 360°

• ​recognise the properties of angles on perpendicular and intersecting lines

• ​recognise the properties of angles on parallel lines

Multiple Choice

Which of the angles is acute angle?

• angle a

• angle b

• angle c

• angle d

Multiple Choice

Which of the angles is obtuse angle?

• angle a

• angle b

• angle c

• angle d

Multiple Choice

Which of the angles is right angle?

• angle a

• angle b

• angle c

• angle d

Multiple Choice

Which of the angles is reflex angle?

• angle a

• angle b

• angle c

• angle d

Multiple Choice

ABC is a straight line.

What is the value of $$x$$  ?

(hint: 20⁰+54⁰=74⁰)

• 20⁰

• 54⁰

• 90⁰

• 106⁰

Multiple Choice

Two angles of a triangle are 50⁰ and 30⁰.

What is the measure of the third angle?

• 30⁰

• 50⁰

• 80⁰

• 100⁰

​5.1. A Sum of 360⁰

• ​The sum of the angles on a straight line is

• ​The sum of the angles around a point is

Multiple Choice

Which of the followings is true to calculate angle a?

• a = 90⁰ + 116⁰

• a = 360⁰ - 116⁰

• a = 180⁰ + 116⁰

• a = 180⁰ - 116⁰

Multiple Choice

What is the value of angle b?

• 125⁰

• 235⁰

• 145⁰

• 305⁰

Multiple Choice

What is the value of angle c?

(hint: 36⁰+68⁰+52⁰=156⁰)

• 24⁰

• 336⁰

• 246⁰

• 204⁰

​5.2. The Intersecting Lines

Multiple Choice

What is the value of angle x?

• 53⁰

• 90⁰

• 180⁰

• 127⁰

Multiple Choice

What is the value of angle y?

• 53⁰

• 90⁰

• 180⁰

• 127⁰

Multiple Choice

What is the value of angle a?

• 67⁰

• 90⁰

• 113⁰

• 180⁰

Multiple Choice

What is the value of angle b?

• 67⁰

• 90⁰

• 113⁰

• 180⁰

Multiple Choice

What is the value of angle c?

• 67⁰

• 90⁰

• 113⁰

• 180⁰

Multiple Choice

What is the value of angle a?

• 77⁰

• 90⁰

• 103⁰

• 180⁰

Multiple Choice

What is the value of angle b?

• 77⁰

• 90⁰

• 103⁰

• 180⁰

Multiple Choice

What is the value of angle c?

• 77⁰

• 90⁰

• 103⁰

• 180⁰

Poll

Choose the topics you have already understood!

• i know the sum of angles on a staright line is 180⁰

• i know the sum of angles around a point is is 360⁰

• i know the angle properties of intersecting lines

• i know the angle properties of parallel lines

• i know the angle properties of parallel lines and transversal lines

Open Ended

Thank you.