Calculating-Angles Ver 2
Calculating-Angles Ver 2
Calculating-Angles Ver 2
Using your knowledge of known facts about triangles, calculate the size of the missing angles
in the triangles below. Angles are not to scale.
1. 38°
2. 3.
72°
43°
20°
4. 5. 6.
32°
105°
64°
50°
7. 8. 9.
38°
23°
54°
120° 32°
2. Jake, Omar and Saskija are playing a game. Jake and Omar must give Saskija clues to help
her find the triangle that matches theirs.
Jake:
The triangle has a right angle. 45°
Omar:
24°
It is a scalene triangle.
66°
45°
3. Dara is trying to solve a riddle. Her only clue is that the ratio of the three angles in the
mystery triangle is 2:3:4. Calculate the size of the angles and write them below from
smallest to largest:
4. Shaali, Caitlyn and Aleisha are investigating scalene triangles. They have each been given
a scalene triangle with one 52° angle labelled for them and two missing angles that they
must measure.
152°
° ° °
x= y= z=
72°
56°
x
° ° °
x= y= z=
71°
43°
4. 5. 6.
80° 26°
43° 32°
105°
64°
50°
50°
7. 8. 9.
56°
122°
38°
50°
68°
40° 56° 20°
63° 37°
120° 32°
42°
2. Jake, Omar and Saskija are playing a game. Jake and Omar must give Saskija clues to help
her find the triangle that matches theirs.
Jake:
The triangle has a right angle. 45°
Omar:
24°
It is a scalene triangle.
66°
45°
3. Dara is trying to solve a riddle. Her only clue is that the ratio of the three angles in the
mystery triangle is 2:3:4. Calculate the size of the angles and write them below from
smallest to largest:
4. Shaali, Caitlyn and Aleisha are investigating scalene triangles. They have each been given
a scalene triangle with one 52° angle labelled for them and two missing angles that they
must measure.
Caitlyn has made a mistake. (Her angles add up to more than 180°.)
152°
72°
56°
x