i-Ready Diagnostic Test Diagnostic Measurement, Data, and Geometry 3 — Questions and Answers
Question 1: A circle has a diameter of 10 cm. What is its circumference? (Use π ≈ 3.14)
- 31.4 cm (Correct answer)
- 62.8 cm
- 15.7 cm
- 78.5 cm
Correct answer: 31.4 cm
Circumference = π × diameter = 3.14 × 10 = 31.4 cm.
Question 2: The stem-and-leaf plot shows stems 1, 2, 3 with leaves 2 4 | 1 3 5 | 0 2. What is the median?
- 21 (Correct answer)
- 24
- 30
- 13
Correct answer: 21
The data set is 12, 14, 21, 23, 25, 30, 32; the median (middle value) is 21.
Question 3: A trapezoid has parallel sides of 8 m and 12 m and a height of 5 m. What is its area?
- 50 m² (Correct answer)
- 60 m²
- 40 m²
- 100 m²
Correct answer: 50 m²
Area of trapezoid = ½ × (b₁ + b₂) × h = ½ × (8 + 12) × 5 = 50 m².
Question 4: Which transformation moves every point of a figure the same distance in the same direction?
- Translation (Correct answer)
- Reflection
- Rotation
- Dilation
Correct answer: Translation
A translation slides a figure without turning or flipping it.
Question 5: A data set has a mean of 15 and 6 values. If five values sum to 83, what is the sixth value?
- 7 (Correct answer)
- 9
- 5
- 11
Correct answer: 7
Total sum = 15 × 6 = 90; sixth value = 90 − 83 = 7.
Question 6: A rectangular prism has length 5 ft, width 3 ft, and height 4 ft. What is its surface area?
- 94 sq ft (Correct answer)
- 60 sq ft
- 120 sq ft
- 47 sq ft
Correct answer: 94 sq ft
SA = 2(lw + lh + wh) = 2(15 + 20 + 12) = 2(47) = 94 sq ft.
Question 7: Two lines intersect forming four angles. One angle measures 65°. What is the measure of the angle directly across from it (vertical angle)?
- 65° (Correct answer)
- 115°
- 25°
- 130°
Correct answer: 65°
Vertical angles are congruent, so the opposite angle also measures 65°.
i-Ready Diagnostic Test Diagnostic Measurement, Data, and Geometry 3
A circle has a diameter of 10 cm.
What is its circumference? (Use π ≈ 3.14)