Finding the area of clock

Question
Mr. Jeffries is making a wooden clock. The clock has a diameter of 9 inches. What is the area of the face of the clock to the nearest tenth of a square inch?
Answer
STEP 1:   

You are given the diameter of clock, and you have to find the area of the face of the clock to the nearest tenth of a square inch. The basic formula used to calculate the area of a circle is:
area of a circle formula

In the formula, the variable d denotes the diameter of the clock.

STEP 2:    Since you know the diameter and the value of π , you can substitute it in the formula.
using area of circle formula


STEP 3:    Now, you have to round the answer to 1 decimal place. You have to take the digit after the desired decimal place. If the digit after the desired decimal place is greater than 4, then the number at the desired decimal place has to be by 1. Since the obtained answer has 8 after the desired decimal place, which is greater than 4, you can round the answer to 63.6.

The area of the face of the clock to the nearest tenth of a square inch is obtained as
63.6 in2.

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Algebra Library.

iPod Touch & iPhone
iPad
Graphs & Equations
Algebra
Exponents
Symmetry
Fractions
Measurements
Interest
Angles
Triangles
Useful Resources