📐 Part 1: Angles on a Straight Line

1. Two angles on a straight line measure 75° and x°. What is the value of x?

105°

115°

125°

285°

2. Three angles on a straight line are 45°, 85°, and y°. Calculate the value of y.

y = _______°

3. If angles on a straight line are in the ratio 2:3:4, find each angle.

4. Which statement about angles on a straight line is correct?

They always add up to 90°

They always add up to 180°

They always add up to 360°

They can add up to any value

📊 Part 2: Triangles and Angle Properties

5. In a triangle, two angles measure 65° and 48°. What is the third angle?

Third angle = _______°

6. An isosceles triangle has a base angle of 55°. What are the other two angles?

7. In triangle ABC, angle A = 3x°, angle B = 2x°, and angle C = x°. Find the value of x and all three angles.

8. Which of these angle combinations could form a triangle? (Select all that apply)

60°, 60°, 60°

90°, 45°, 45°

100°, 50°, 40°

120°, 30°, 30°

9. Draw and label a diagram showing two intersecting straight lines. Mark the angles formed and explain the relationship between opposite angles.

10. A triangle has angles measuring (2x + 10)°, (3x - 5)°, and (x + 25)°. Find the value of x and determine what type of triangle this is.