TRIANGLE BASICS Classify each triangle by the ... - Midway ISD - Free Printable

Let’s solve each part of the worksheet step by step.

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Part 1: Classify each triangle by the length of its sides

Rule:
- Equilateral: All three sides equal (marked with same tick marks).
- Isosceles: Two sides equal.
- Scalene: No sides equal.

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1. Triangle with all angles 60° and all sides marked with single tick → Equilateral

✔ Answer: Equilateral

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2. Triangle with right angle symbol and two sides marked with double tick → Isosceles (and also right triangle, but we’re classifying by side lengths)

✔ Answer: Isosceles

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3. Triangle with angles 45°, 70°, 65° — all different — and all sides have different tick marks (single, double, triple) → Scalene

✔ Answer: Scalene

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Part 2: Classify each triangle by its angles

Rule:
- Acute: All angles < 90°
- Right: One angle = 90°
- Obtuse: One angle > 90°

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4. Angles: 45°, 70°, 65° — all less than 90° → Acute

✔ Answer: Acute

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5. Angles: 60°, 60°, 60° — all less than 90° → Acute

✔ Answer: Acute

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6. Right angle symbol + two sides equal → Right triangle (by angles)

✔ Answer: Right

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Part 3: Find the value of ‘x’ in each of the following

Rule: Sum of interior angles in any triangle = 180°

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7. Triangle with angles: x°, 52°, 35°

So:

> x + 52 + 35 = 180
> x + 87 = 180
> x = 180 - 87
> x = 93

✔ Answer: 93

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## ✔ Final Answers:

1. Equilateral
2. Isosceles
3. Scalene
4. Acute
5. Acute
6. Right
7. 93

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Let me know if you’d like a visual explanation or want to check your own answers!