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Most angle questions need just a few facts: the angles of a triangle add up to 180°, so do angles on a straight line, and vertically opposite angles are equal. Olympiad options are built from the usual slips — using 360° instead of 180°, or forgetting that an isosceles triangle has two equal angles.
✓ You passed this topic’s test.
180 is the magic number — “a triangle and a straight line both add up to 180°”
Use it for: Triangle, straight-line and crossing-lines questions in Class 6–10 Olympiad papers and geometry chapters.
Check: 65° + 65° + 50° = 180° ✓
Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🏹 Angle Archer badge when you pass — and a certificate when you finish all 13 topics of Part 4 · Class 5–10 problem solving. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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