# Chapter 5: Mensuration Arc Length, Sector Area & Radian Measure - Math Mcqs for Grade 8 - Set 2

1)   If the angle of sector is z° then the formula used to calculate is

a. z°⁄360° x area of major arc
b. z°⁄360° x area of semicircle
c. z°⁄360° x area of circle
d. z°⁄360° x circumference
 Answer  Explanation ANSWER: z°⁄360° x circumference Explanation: No explanation is available for this question!

2)   If the radius is 21 cm and the angle at center of circle is 140° then the length of the arc is

a. 42.23 cm
b. 73.24 cm
c. 51.31 cm
d. 62.42 cm
 Answer  Explanation ANSWER: 51.31 cm Explanation: No explanation is available for this question!

3)   Considering radian, the value of cos 2.3π is

a. 1.832
b. 0.587
c. 2.587
d. 1.684
 Answer  Explanation ANSWER: 0.587 Explanation: No explanation is available for this question!

4)   The formula used to measure area of circle is

a. 4πr²
b. πr²
c. 2πr²
d. πr² + 2r
 Answer  Explanation ANSWER: πr² Explanation: No explanation is available for this question!

5)   By converting 3π⁄2 from radians to degrees, the answer will be

a. 190°
b. 150°
c. 270°
d. 290°
 Answer  Explanation ANSWER: 270° Explanation: No explanation is available for this question!

6)   By converting angle from degrees to the radians, the 40° is equal to

a. 0.287

7)   The quadrilateral whose four vertices are lied on circumference of circle is called

8)   The system of angular measurement is known as

a. perimeter measure
b. chord measure
c. circular measure
 Answer  Explanation ANSWER: circular measure Explanation: No explanation is available for this question!

9)   By converting π⁄3 from radians to degrees, the answer will be

a. 55°
b. 75°
c. 65°
d. 60°
 Answer  Explanation ANSWER: 60° Explanation: No explanation is available for this question!

10)   The smallest part of the circle divided by the chord is called

a. minor segment
b. major segment