triangles quiz grade 4

📚 Quick Study Guide

• 📐 Definition: A triangle is a polygon with three sides, three angles, and three vertices.
• ➕ Angle Sum: The sum of the angles inside any triangle is always 180 degrees ($180^{\circ}$).
• 📏 Types by Sides:
  • Equilateral: All three sides are equal.
  • Isosceles: At least two sides are equal.
  • Scalene: No sides are equal.
• ➗ Types by Angles:
  • Acute: All angles are less than 90 degrees.
  • Right: One angle is exactly 90 degrees.
  • Obtuse: One angle is greater than 90 degrees.

📝 Practice Quiz

1. Which of the following is NOT a type of triangle?
   1. Equilateral
   2. Square
   3. Isosceles
   4. Scalene
2. A triangle has angles measuring 60°, 60°, and 60°. What type of triangle is it?
   1. Right
   2. Obtuse
   3. Equilateral
   4. Scalene
3. What is the sum of the angles inside any triangle?
   1. 90°
   2. 180°
   3. 270°
   4. 360°
4. A triangle has one angle measuring 90°. What type of triangle is it?
   1. Acute
   2. Obtuse
   3. Right
   4. Equilateral
5. Which type of triangle has no equal sides?
   1. Equilateral
   2. Isosceles
   3. Scalene
   4. Right
6. A triangle has sides measuring 3cm, 4cm, and 5cm. What type of triangle could it be (based on sides)?
   1. Equilateral
   2. Isosceles
   3. Scalene
   4. Right
7. A triangle has angles measuring 30°, 60°, and 90°. What type of triangle is it?
   1. Acute
   2. Obtuse
   3. Right
   4. Equilateral