Question

brainlist kopo yung nag answer ng tama

I. Answer each question. Write the letter of the correct answer in your paper.
Read and analyze the following problems carefully. Then, write your answer on a separate sheet of paper.

_____1. In a given circle, the radius is 9 cm. What is its diameter?


A. 18 m
B.18 cm
C. 4.5 m
D. 4.5 cm

_____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=2 πr2

_____3. The diameter of a circle is8 cm, what is its area?


A.50.24 cm2
B.200.96 cm2
C.25.12 cm2
D.100.48 cm2

_____4. What is the radius of a circle if the area is 36m2?


A. 0.339 m
B. 3.39 m
C. 33.9 m
D. 339m
_____5. What is the area of a circle if the radius is 5m?


A. 15. 7 m2
B. 31.4 m2
C. 78.5 m2
D. 157 m2

Answer 1

Detailed Answers:

1) B) 18 cm

Radius (r) = 9 cm
Diameter (d) = 2r = 9 * 2 = 18 cm

2) B) A = πr^2

3) A) 50.24 cm^2

Diameter (d) = 8 cm
Radius (r) = d/2 = 8/2 = 4 cm

Area (A) = πr^2

Therefore,
= πr^2
= 3.14 * 4 * 4
= 3.14 * 16
=> 50.24

Area (A) = 50.24 cm^2

4) B) 3.39 m

Area (A) = πr^2 = 36 m^2

Therefore,
πr^2 = 36
3.14 * (r^2) = 36
r^2 = 36/3.14
r^2 = 3600/314
r^2 = 11.46
r = √11.46
=> r = 3.39

Radius (r) = 3.39 m

5) C) 78.5 m^2

Radius (r) = 5 m

Area (A) = πr^2

Therefore,
= πr^2
= 3.14 * 5 * 5
= 3.14 * 25
=> 78.5

Area (A) = 78.5 m^2