Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

The length and breadth of a rectangle are respectively increased by 9% and 1%. What is the % increase in the area?

### Question 2

A gun is fired towards a circular board consisting of two concentric circles of radii 10 and 4 cm. If each bullet is able to hit the board, what is the probability that it will strike the ring, i.e., the area between the inner and outer circles?

**A**

${21/25}$.

**B**

${7/10}$.

**C**

1/2.

**D**

${21/40}$.

**Soln.**

**Ans: a**

The area of the ring is equal to the difference of the areas of the two circles. π($10^2 - 4^2$) = 84π sq. cm. The total area is π × 10^{2} = 100π. The probability of hitting the ring is ${84π}/{100π}$ = ${21/25}$.

### Question 3

A rectangular wire 22 × 3 is re-aligned into a rectangle 11 × 9. What is the percentage increase in area?

### Question 4

The length of a square is increased by 4%, what is the % increase in area?

### Question 5

Three squares have their sides such that they are in an AP(Arithmetic Progression). If the side of the middle square is 19, what is the area of the square whose side is equal to the sum of the sides of these three squares?

### More Chapters | See All...

Alligations and Mixtures | Alphabet Number Series | Missing Numbers | Averages | Basic Simplification | Areas | Clocks and Calendars | Sitting Arrangements | Hidden Figures | Ranking Test | More...

This Blog Post/Article "Areas Quiz Set 012" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2019-08-18.