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Learning objective overview
Master Teaching Guide coverage for this objective.
Current NZC (2007)
GM5-5
New NZC (2026)
NZC26-P4-GEO-SHP-P-Y10-01NZC26-P3-GEO-SHP-K-Y7-03NZC26-P3-GEO-SHP-K-Y7-04NZC26-P3-GEO-SPR-K-Y7-03
Resources
- Alpha textbook: Angles in a triangle, Ex 25.02, pg 415-416
- Dr Austin Maths - Angles in Triangles Practice GridQuestions PDF · Answers
- Dr Austin Maths - Angles in Triangles and Quadrilaterals Practice GridQuestions PDF · Answers
- CorbettMaths on angles in trianglesQuestions PDF · Answers
- Beta: Exercise 18.04, pgs 345 & 346
- Beta: Exercise 18.05, pgs 347 & 348
Terminology
- triangle
- scalene triangle
- isosceles triangle
- equilateral triangle
Task goals
- Find a missing angle in a scalene, isosceles, equilateral, or right-angled triangle from a labelled diagram, using the 180-degree angle sum.
- Use the equal base angles of an isosceles triangle to find both remaining angles from one given angle.
- Explain why every equilateral triangle has three 60-degree angles.
- Set up and solve an equation when one or more interior angles are given as an algebraic expression.
- Find all three angles when they are given as a ratio, and name the triangle using angle language.
- Decide whether a given set of angles can form a triangle, and explain an incorrect claim using the angle-sum rule.
Where this fits
What leads into this objective, and where it goes next.
Before
No prerequisite objective linked yet.
You are here
Interior angles of a triangle
Know
The interior angle sum of a triangle is 180°; for a quadrilateral, it is 360°.
Statement▸
Year 7 · Geometry · Spatial reasoning
NZC26-P3-GEO-SPR-K-Y7-03
Also under GM5-5:
For teachers
Need the fuller teaching notes for this objective? Open the Teacher guidance PDF.