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Glencoe Math: Course 2, Volume 2
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Glencoe Math: Course 2, Volume 2 View details
2. Area of Circles
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Exercise 24 Page 629

The area of a circle equals the product of π and the square of its radius.

About 45.3ft^2

Practice makes perfect

We are given that a circle has a radius of 3 45 feet.

Circle
We want to find the area of the circle. Recall that the area A of a circle equals the product of π and the square of its radius r. A = π r^2 In this case, r= 3 45. Let's calculate the area using this information. We can use 3.14 for π.
A = π r^2
Substitute

r= 3 45

A = π [( 3 45)^2]

π ≈ 3.14

A ≈ 3.14 [(3 45)^2]
▼
Write mixed number as a fraction
MixedToFrac

a bc=a* c+b/c

A ≈ 3.14 [(3* 5 + 4/5)^2]
Multiply

Multiply

A ≈ 3.14 [(15 + 4/5)^2]
AddTerms

Add terms

A ≈ 3.14 [(19/5)^2]
PowQuot

(a/b)^m=a^m/b^m

A ≈ 3.14 [19^2/5^2]
CalcPow

Calculate power

A ≈ 3.14 [361/25]
MoveLeftFacToNum

a*b/c= a* b/c

A ≈ 3.14 * 361/25
Multiply

Multiply

A ≈ 1133.54/25
CalcQuot

Calculate quotient

A ≈ 45.3416
RoundDec

Round to 1 decimal place(s)

A ≈ 45.3
We found that A ≈ 45.3, which means that the area of the circle is about 45.3 square feet.
Subchapter links expand_more
arrow_right Guided Practice p.626
1
Guided Practice 2 (Page 626)
Guided Practice 3 (Page 626)
Guided Practice 4 (Page 626)
5
arrow_right Independent Practice p.627-628
Independent Practice 1 (Page 627)
Independent Practice 2 (Page 627)
Independent Practice 3 (Page 627)
Independent Practice 4 (Page 627)
Independent Practice 5 (Page 627)
Independent Practice 6 (Page 627)
Independent Practice 7 (Page 627)
Independent Practice 8 (Page 627)
Independent Practice 9 (Page 627)
Independent Practice 10 (Page 627)
Independent Practice 11 (Page 627)
Independent Practice 12 (Page 627)
13
arrow_right H.O.T. Problems p.628
14
15
16
17
18
arrow_right Standardized Test Practice p.628-630
19
33
34
arrow_right Extra Practice p.629
Extra Practice 21 (Page 629)
Extra Practice 22 (Page 629)
Extra Practice 23 (Page 629)
Extra Practice 24 (Page 629)
Extra Practice 25 (Page 629)
Extra Practice 26 (Page 629)
Extra Practice 27 (Page 629)
Extra Practice 28 (Page 629)
Extra Practice 29 (Page 629)
Extra Practice 30 (Page 629)
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32
arrow_right Common Core Review p.630
35
Common Core Review 36 (Page 630)
Common Core Review 37 (Page 630)
Common Core Review 38 (Page 630)