Answer:
Solution: 1. The formula of diameter: d=2r
So d=2x9= 18 ccm), choose B.
solution: The area formula for a circle: A = πr² So choose B.
solution: The radius of the circle: r = d÷2=8=2=4 (cm) A =πur² = 3, 14x4² = 3.14x16 = 50.24 (cm³), choose A
solution: 4. A = r² = 3.14) = 36
r² = 36=3,14 = 11.465
r = √11.465 = 3.39 (m). Choose B
solution: 5. A=πr² = 3.14x5² = 3.14×25 = 78.5 (m²)
So choose c.
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1. B
Solution: 1. The formula of diameter: d=2r
So d=2x9= 18 ccm), choose B.
2. B
solution: The area formula for a circle: A = πr² So choose B.
3. A
solution: The radius of the circle: r = d÷2=8=2=4 (cm) A =πur² = 3, 14x4² = 3.14x16 = 50.24 (cm³), choose A
4. B
solution: 4. A = r² = 3.14) = 36
r² = 36=3,14 = 11.465
r = √11.465 = 3.39 (m). Choose B
5. C
solution: 5. A=πr² = 3.14x5² = 3.14×25 = 78.5 (m²)
So choose c.
#brainliestme
#Hopeithelp