Classify triangles

key notes :

🔺 CLASSIFY TRIANGLES 🔺

Triangles can be classified based on sides and angles!
Let’s explore both 👇

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🟢 Classification by Sides

1️⃣ Equilateral Triangle 🔹

👉 All three sides are equal.
👉 All three angles are 60°.
✨ Example: △ABC where AB = BC = CA

💡 Tip: “Equi” means equal – easy to remember! ⚖️

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2️⃣ Isosceles Triangle 🔸

👉 Two sides are equal.
👉 Two angles opposite those sides are also equal.
✨ Example: △PQR where PQ = PR

💡 Tip: “Iso” means same – two sides same! 😄

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3️⃣ Scalene Triangle 🔺

👉 All sides are different.
👉 All angles are different.
✨ Example: △XYZ where XY ≠ YZ ≠ ZX

💡 Tip: “Scalene” = “Scale of difference” 🎚️

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🔵 Classification by Angles

1️⃣ Acute-angled Triangle 🌞

👉 All angles are less than 90°.
✨ Example: 50°, 60°, 70°

💡 Tip: “Acute” = cute little angles 💖

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2️⃣ Right-angled Triangle 📏

👉 Has one 90° angle.
👉 Follows Pythagoras Theorem:
a²+b²=c²
✨ Example: 3-4-5 triangle

💡 Tip: Think of it like a “corner” 👟

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3️⃣ Obtuse-angled Triangle 🌙

👉 Has one angle greater than 90°.
👉 The other two angles are acute.
✨ Example: 120°, 30°, 30°

💡 Tip: “Obtuse” = “Big and broad” 😴

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💫 Bonus Facts!

✅ The sum of all interior angles of a triangle = 180° 🧮
✅ A triangle is the simplest polygon (3 sides).
✅ The area of a triangle =

Area = 1/2 × base × height

✅ The perimeter = sum of all sides.

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🧠 Quick Recap Table

Type	Based On	Property	Example
Equilateral	Sides	All sides & angles equal	60°, 60°, 60°
Isosceles	Sides	2 sides equal	70°, 70°, 40°
Scalene	Sides	All sides different	50°, 60°, 70°
Acute	Angles	All < 90°	50°, 60°, 70°
Right	Angles	One = 90°	30°, 60°, 90°
Obtuse	Angles	One > 90°	30°, 30°, 120°

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🌟 Remember:

➡️ Every triangle has 3 sides, 3 angles, and 3 vertices!
➡️ It’s the strongest shape in geometry 💪🔺

Learn with an example

Let’s practice!