Selected MCQ

Current Question
If the sides of a triangle are 26 cm, 24 cm, and 10 cm, what is its area?
  • A. 120 cm²
  • B. 130 cm²
  • C. 312 cm²
  • D. 315 cm²
Correct Answer: A
Explanation:
Using Heron’s formula, area = 120 cm².
Related Question 1
The perimeter of a triangle is 28 cm, and its inradius is 2.5 cm. Find its area.
  • A. 25 cm²
  • B. 42 cm²
  • C. 49 cm²
  • D. 35 cm²
Correct Answer: D
Explanation:
Area = r × semi-perimeter = 2.5 × 14 = 35 cm².
Related Question 2
If errors of 5% and 3% are made in measuring the sides of a rectangle, what is the percentage error in the area?
  • A. 8.35%
  • B. 7.15%
  • C. 8.15%
  • D. 6.25%
Correct Answer: C
Explanation:
Total error ≈ 5 + 3 + (5×3)/100 = 8.15%.
Related Question 3
If a triangle has sides 3 cm, 4 cm, and 5 cm, what type of triangle is it?
  • A. Equilateral
  • B. Isosceles
  • C. Right-angled
  • D. Obtuse
Correct Answer: C
Explanation:
3² + 4² = 5².
Related Question 4
The area of a triangle with base 10 cm and height 6 cm is ____.
  • A. 20
  • B. 25
  • C. 30
  • D. 35
Correct Answer: C
Explanation:
Area = ½ × 10 × 6 = 30.
Related Question 5
The area of a square with side x equals the area of a triangle with base x. What is the height of the triangle?
  • A. x/2
  • B. x
  • C. 2x
  • D. 4x
Correct Answer: C
Explanation:
Equating areas: x² = ½ × x × h ⇒ h = 2x.