Mrs.D Math · 7th Grade

AREA
ACE

Area of Circles
A = πr²
r = d ÷ 2
π ≈ 3.14
◯ A from radius
◯ A from diameter
🔎 Find radius
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📚 Area of Circles

The Formula: A = πr²

1
Identify the radius. If given the diameter, divide by 2 first.
d=10 → r = 10 ÷ 2 = 5
2
Square the radius (multiply r × r).
r=5 → r² = 5 × 5 = 25
3
Multiply by π ≈ 3.14.
A = 3.14 × 25 = 78.5

Finding the Radius from Area

1
Divide area by π: r² = A ÷ 3.14
A=78.5 → 78.5 ÷ 3.14 = 25
2
Take the square root to find r.
r²=25 → r = √25 = 5
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FIND AREA
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