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Answer the following multiplechoice questions on types of triangles. 
1. Which triangle has all three sides equal in length? • Equilateral • Isosceles
• Scalene
Answer: EquilateralIn an equilateral triangle, all sides are equal in length.
2. What type of triangle is Δ ABC, where AB = AC = BC = 18 cm? (Note: cm denotes centimeter.) • Equilateral • Isosceles
• Scalene
Answer: EquilateralIn an equilateral triangle, all sides are equal in length.
3. What type of triangle has all angles measuring 60°? • Equilateral • Isosceles
• Scalene
Answer: EquilateralAn equilateral triangle has all angles equal and measuring 60°. An equilateral triangle is also referred to as an equiangular triangle. Equilateral means 'equal sides', whereas equiangular means 'equal angles'.
4. What type of triangle is Δ ABC, where ∠A = ∠B = ∠C = 60°? • Equilateral • Isosceles
• Scalene
Answer: EquilateralAn equilateral triangle has all angles equal and measuring 60°. An equilateral triangle is also referred to as an equiangular triangle. Equilateral means 'equal sides', whereas equiangular means 'equal angles'.
5. A triangle has two sides measuring 10 meters and one side measuring 7 meters. What type of triangle is this? • Equilateral
• Isosceles • Scalene
Answer: IsoscelesIn an isosceles triangle, two sides are equal in length.
6. What type of triangle is Δ ABC, where AB = 51 km, AC = 51 km and BC = 25 km? (Note: km denotes kilometer.) • Equilateral
• Isosceles • Scalene
Answer: IsoscelesIn an isosceles triangle, two sides are equal in length.
7. A triangle has two angles measuring 45° and one angle measuring 90°. What type of triangle is this? • Equilateral
• Isosceles • Scalene
Answer: IsoscelesIn an isosceles triangle, two sides are equal in length. If two sides of a triangle are equal, then the angles opposite to them are equal (as per the isosceles triangle theorem in Euclidean geometry).
8. What type of triangle is Δ ABC, where ∠B = ∠C = 75°? • Equilateral
• Isosceles • Scalene
Answer: IsoscelesIn an isosceles triangle, two sides are equal in length. If two sides of a triangle are equal, then the angles opposite to them are equal (as per the isosceles triangle theorem in Euclidean geometry).
9. Which triangle has three unequal sides? • Equilateral
• Isosceles
• Scalene Answer: ScaleneIn a scalene triangle, all sides and internal angles are different from one another.
10. What type of triangle is Δ ABC, where AB = 12 in, BC = 13 in and AC = 8 in? (Note: in denotes inches.) • Equilateral
• Isosceles
• Scalene Answer: ScaleneIn a scalene triangle, no two sides are equal in length.
11. A triangle has angles measuring 60°, 68° and 52°. What type of triangle is this? • Equilateral
• Isosceles
• Scalene Answer: ScaleneIn a scalene triangle, all sides and internal angles are different from one another.
12. What type of triangle is Δ XYZ, where ∠X = 51°, ∠Y = 63° and ∠Z = 66°? • Equilateral
• Isosceles
• Scalene Answer: ScaleneIn a scalene triangle, all sides and internal angles are different from one another.
13. Which triangle has all three angles less than 90°? • Acute • Right
• Obtuse
Answer: AcuteA triangle that has all interior angles measuring less than 90° is an acute triangle or acuteangled triangle.
14. A triangle has angle measurements of 35°, 77°, and 68°. What type of triangle is this? • Acute • Right
• Obtuse
Answer: AcuteA triangle that has all interior angles measuring less than 90° is an acute triangle or acuteangled triangle.
15. What type of triangle is Δ XYZ, where ∠X = 50°, ∠Y = 63° and ∠Z = 67°? • Acute • Right
• Obtuse
Answer: AcuteA triangle that has all interior angles measuring less than 90° is an acute triangle or acuteangled triangle.
16. An equilateral triangle is also an _______ triangle. • Acute • Right
• Obtuse
Answer: AcuteIn an equilateral triangle, all angles are 60°. Hence, it is an acute triangle or acuteangled triangle.
17. Which triangle has an angle equal to 90°? • Acute
• Right • Obtuse
Answer: RightA triangle that has an angle measuring 90° is a right triangle or rightangled triangle.
18. A triangle has angle measurements of 90°, 38°, and 52°. What type of triangle is this? • Acute
• Right • Obtuse
Answer: RightA triangle that has an angle measuring 90° is a right triangle or rightangled triangle.
19. What type of triangle is Δ PQR, where ∠Q = 90°? • Acute
• Right • Obtuse
Answer: RightA triangle that has an angle measuring 90° is a right triangle or rightangled triangle.
20. In a right triangle, what is the side opposite to the right angle called? • Altitude
• Hypotenuse • Leg
Answer: HypotenuseThe side opposite to the right angle is the hypotenuse. It is the longest side in the right triangle. The other two sides are called the legs of the right triangle.
21. Which triangle has an angle greater than 90°? • Acute
• Right
• Obtuse Answer: ObtuseA triangle that has an angle measuring more than 90° is an obtuse triangle or obtuseangled triangle.
22. What type of triangle is Δ ABC, where ∠A = 139°, ∠B = 16° and ∠C = 25°? • Acute
• Right
• Obtuse Answer: ObtuseA triangle that has one angle measuring more than 90° is an obtuse triangle or obtuseangled triangle.
23. A triangle has angle measurements of 36°, 30°, and 114°. What type of triangle is this? • Acute
• Right
• Obtuse Answer: ObtuseA triangle that has one angle measuring more than 90° is an obtuse triangle or obtuseangled triangle.
24. What is a triangle that contains no right angle called? • Right
• Oblique • Opaque
Answer: ObliqueA triangle that does not contain a right angle is called an oblique triangle.
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