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Write the letter of the correct answer.
1.In a given circle,the radius is 9cm.What is it's diameter?
A.18m
B.18cm
C.4.5m
D.4.5cm
2.Which of the following is the formula in solving for the area of a circle?
A. A= 2πr
B. A= πr²
C. A= πd
D. A=2πr²
3.The diameter of a circle is 8cm,what is it's area?
A. 50.24cm²
B. 200.96cm²
C. 25.12cm²
D. 100.48cm²
4.What is the radius of a circle if the area is 36m²?
A. 0.339m
B. 3.39m
C. 33.9m
D.339m
5. What is the area of a circle if the radius is 5m?
A. 15.7m²
B. 31.4m²
C.78.5m²
D.157m²


Sagot :

Answer:

  1. b
  2. b
  3. a
  4. b
  5. c

Solution:

  1. D=2r or 2×r

D=(2)(9)

D=18cm

2. A = π r²

The area of a circle is pi times the radius squared (A = π r²)

3. 3.14×8=25.12 and then multiply it by 2

25.12×2=50.24cm²

4.To find the radius, divide the area by pi, then take the square root.

A=πr². Find the radius:

Area=36m². 36m² =3.14

π=3.14. 3.14 3.14

r=? √11.54=√r²

3.39=r

5.A=πr²

A=(3.14)(5)²

=(3.14)(25)

=78.5m²

Step-by-step explanation:

I hope it helps po