7. e = 2A - f
72. Area = 615.8 in.²
Circumference = 88.0 in.²
73. Area = 615.8 in.²
Circumference = 88.0 in.²
74. Missing length = √40 ≈ 6.3
75. Missing length = √45 ≈ 6.7
76. Scale factor = 18/6 = 3
77. Scale factor = 12/4 = 3
What is the Area and Circumference of a Circle?
Area = πr²
Circumference = 2πr
7. A = (e + f)/2
2A = e + f
2A - f = e
e = 2A - f
72. r = 14 in.
Area = πr² = π(14²) = 615.8 in.²
Circumference = 2π(14) = 88.0 in.²
73. r = 30.2/2 = 15.1
Area = πr² = π(15.1²) = 615.8 in.²
Circumference = 2π(15.1) = 88.0 in.²
74. Missing length = √(6² + 2²) [Pythagorean Theorem]
Missing length = √40 ≈ 6.3
75. Missing length = √(6² + 3²) [Pythagorean Theorem]
Missing length = √45 ≈ 6.7
76. Scale factor = 18/6 = 3
77. Scale factor = 12/4 = 3
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