TalentJR apps
An angle measures a turn, in degrees (°). Less than 90° is acute, exactly 90° is a right angle (like the corner of a book), between 90° and 180° is obtuse, and 180° is a straight angle. Angles on a straight line add up to 180°, the angles of a triangle add up to 180°, and angles around a point add up to 360°.
✓ You passed this lesson’s test.
Know the totals — “a right angle is 90°, a straight line 180°, a full turn 360°”
Use it for: Clock hands, ramps and roofs, drawing with a protractor, and the angles chapter of Class 5 maths.
Check: 65 + 115 = 180 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 📐 Angle Ace badge when you pass — and a certificate when you finish all 8 lessons of Part 5 · Class 5. 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.
Prefer a real teacher? TalentJR teachers take live online classes anywhere in India and visit homes in selected cities. Tell us what you need and our team will call you with timings and fees.