Free sample · Sec 1
G3 Sec 1 G1 Angles, triangles and polygons
Angles, triangles and polygons. Five printed grains. No account needed.
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1.1 angle types
Look at the four openings. Notice the width. Square corner is right. Smaller is acute. Wider is obtuse. Past a straight line is reflex. Name the gap, then you know which missing angle you are after.
1.2 angle facts
Look at the crossing. Facing angles: vertically opposite. Sitting on one straight line: angles on that line. Filling one point: angles at a point. Name the job, that finds the missing angle.
1.3 parallel lines
Look at the two parallels and the cut. Same corner place: corresponding. The Z pair: alternate. Between the parallels, same side: interior. Name the pair so you can find the missing angle.
1.4 named regular polygons
Look at the regular pentagon, hexagon, octagon, and decagon. On a regular one, sides and angles match. That is the symmetry. Name the shape. A missing side or angle has a match.
1.6 interior/exterior angle sum
Look at any convex polygon. Corners inside: interior angle sum. Turns outside: exterior angle sum. Name which sum you need. That is how you find the missing angle.
The full Sec 1 path continues from here
Also free: Addition within 10 · Subtraction within 10 · Addition within 20 · Subtraction within 20 · Equal groups · Sharing equally · Money · Length · Time · 2D Shapes · Picture Graphs · Whole Numbers · Numbers up to 1000 · Addition · Subtraction · Times tables · Division · Fraction of a Whole · Fraction addition · Fraction subtraction · P2 Money · P2 Length · P2 Mass · P2 Volume · P2 Time · P2 2D Shapes · P2 3D Shapes · P2 Graphs · P3 Numbers · P3 Addition · P3 Subtraction · P3 Mental · P3 Mental sub · P3 Times · P3 Within · P3 Remainder · P3 Algorithm · P3 Long divide · P3 Mental × · P3 Mental ÷ · P3 Equivalent · P3 Simplest · P3 Compare · P3 Given · P3 Frac + · P3 Frac − · P3 Money · P3 Money − · P3 km · P3 ml · P3 km m · P3 Convert · P3 From m · P3 m cm · P3 From cm · P3 kg g · P3 From g · P3 ℓ ml · Sec 1 Angles. The rest of P1–Sec 4 unlock after the parent PayNow subscription.