Math · Stage 4
Classify triangles by their sides and angles (equilateral, isosceles, scalene, right-angled)
Name a triangle by its sides — equilateral (3 equal), isosceles (2 equal), scalene (all different) — and spot a right-angled triangle by its square corner.
✦ Math📘 Stage 4 · S4⏱ ~10 min🧒 Ages 8–9★ Free to start
I can classify triangles by their sides and angles as equilateral, isosceles, scalene or right-angled.
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Kavi's Triangle Detective 🔺
Kavi lays three triangles on the branch. "Every triangle has 3 sides and 3 corners — but they are not all the same!" hoots Kavi. "I can name one by measuring its sides — all equal, two equal, or all different — and I can spot a right-angled one by its little square corner. Let's be triangle detectives!"
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What your child will learn
1Four ways to name a triangleA triangle always has 3 straight sides and 3 corners. We can name it by its sides (how many are equal) or by its angle (does it have a square corner?). Tap each name to learn its clue.
2Sort each triangle by its sides
3Named by sides, or named by its angle?There are two different ways to name a triangle. Tap each card to see how it works.
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A peek inside
A triangle has sides 6 cm, 6 cm and 6 cm. What type is it?
all three sides are the same length → equilateral
Try this at home: A triangle has sides 7 cm, 7 cm, 7 cm. What type is it?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Math · Stage 4 · S4 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.