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Four angles are shown below - Junior Cycle Mathematics - Question 9 - 2012
Question 9
Four angles are shown below. Write in the space below each diagram whether the angle is straight, acute, obtuse, right or reflex. 
Answer
- The first angle is an obtuse angle (greater than 90° but less than 180°).
- The second angle is a right angle (exactly 90°).
- The third angle is a reflex angle (greater than 180°).
- The fourth angle is an acute angle (less than 90°).
Step 2
In the diagram below $l_1 \parallel l_2$. Write the measure of each angle shown by an empty box into the diagram, without using a protractor.
Answer
- The angle directly above the 70° is 110°.
- The bottom angle directly under the 70° is 110°.
- The angle on the bottom left is 70°.
- The angle on the bottom right is also 110°.