STD 6 MATHEMATICS LESSON

TOPIC : ANGLES

SUB-TOPIC : INTERIOR ANGLES OF A TRIANGLE.

• Interior angles of a triangle add up to 180°
• Always interior angles of a triangle are 3
• Angles of a straight line add up to 180°
• Angles of a circle Ο add up to 360°

 

CALCULATE THE MISSING ANGLES.

1. Calculate angle C.

2. Calculate angle A.

3. Calculate angle a°

4. If the angle at the aircraft is 45°, What is X°?

5. Calculate the missing angle.

6. Calculate angle x

7. Calculate angle ADB.

8. Triangle XYZ has Angle X and Z being the same with 45° each. What is the size of Angle Y?

9. Triangle QPR is an equilateral triangle. What is the size of angle P?

10. Calculate the angle of a triangle MNO whose largest angle is 100. If the second largest angle is half of the largest, what is the size of the smallest angle?