A. Find the area of each circle. Use a = 3.14. (Note: Circles are not drawn to scale) 1. 2. 3. 5cm 14mm 17 Xcm 4. 5. 20m 2.8cm pa tulong poh kailangan ko ngayun ... Nagagalit maam ko poh haaha
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Answer:
1. 78.5 cm²
2. 615.44 mm²
3. 226. 87 cm²
4. 1256 m²
5. 6.15 cm²
Step-by-step explanation:
Formula: A= πr² wherein π= 3.14
1. Given: r= 5 cm
Solution:
A= π r²
= 3.14 × 5²
= 3.14 × 25
=78.5 cm²
2. Given: r=14 mm
Solution:
A= π r²
= 3.14 × 14²
=3.14 × 196
= 615.44 mm²
3. Given: d= 17 cm
Solution:
1st, solve for the radius
r= d÷ 2
= 17 cm ÷ 2
= 8.5 cm
A= π r²
=3.14 × 8.5²
=3.14 × 72.25
= 226. 87 cm²
4. Given: r=20 m
Solution:
A= π r²
= 3.14 × 20²
= 3.14 × 400
= 1256 m²
5. Given: 2.8 cm
Solution:
1st, solve for the radius
r= d ÷ 2
= 2.8 cm ÷ 2
= 1.4 cm
A=π r²
= 3.14 × 1.4²
= 3.14 × 1.96
= 6.15 cm²