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Year 10 Angles Geometry
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Year 10 Angles Geometry
📐 Part 1: Angles on a Straight Line
1. Angles on a straight line add up to:
90°
180°
270°
360°
2. If two angles on a straight line are 75° and x°, find the value of x.
x = _______°
3. Three angles lie on a straight line. Two angles are 45° and 68°. Calculate the third angle.
Third angle = _______°
4. Which of these angle pairs could lie on a straight line? (Select all that apply)
120° and 60°
95° and 85°
110° and 80°
135° and 45°
🔺 Part 2: Angles in Triangles
5. The sum of angles in any triangle is:
90°
180°
270°
360°
6. In a triangle, two angles are 65° and 48°. Find the third angle.
Third angle = _______°
7. An isosceles triangle has two equal angles of 55° each. What is the third angle?
Third angle = _______°
8. In a right-angled triangle, one of the other angles is 35°. Find the remaining angle.
Remaining angle = _______°
✏️ Part 3: Problem Solving
9. Draw and label a triangle where all three angles are equal. What type of triangle is this and what is each angle?
Type of triangle: ________________
Each angle = _______°
10. Explain why it's impossible for a triangle to have two angles that are each 100°.
11. A triangle has angles in the ratio 2:3:4. Calculate each angle.
Smallest angle = _______°
Middle angle = _______°
Largest angle = _______°
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