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1. Which of the following is the formula in finding the area of a semi-circle?
A A = πr2 ( pi times radius squared)
B A = πr2/2 ( pi times radius squared divided by 2 )
C A = s x s
D A = b x h/2

2. What is the radius of the semi-circle if the diameter is 100 mm?
A 50mm
B 50 square mm
C 100mm
D 100 square mm

3. What is the area of the semi-circle with a radius of 0.4 km?
A 0.2512 sq. km
B 0.5024 sq. km
C 50.24 sq. km
D 25.12 sq. km

4. Find the area of a semi-circle whose diameter is 50 cm?
A 981.25 sq. cm
B 1962.5 sq. cm
C 3925 sq. cm
D 7850 sq. cm

5. Marissa has a circular bed cover with a diameter of 5 m. If she is going to cut it in half, how many square meters will she have in each part?
A 19.625 sq. m
B 9.8125 sq. m
C 78.5 sq. m
D 39.25 sq. m

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Sagot :

itsmeEmmanuel49

Answer:

The area of a semicircle can be calculated using the length of radius or diameter of the semicircle. The formula to calculate the area of the semicircle is given as, Area = πr2/2 = πd2/8, where 'r' is the radius, and 'd' is the deameter

Step-by-step explanation:

Brainliest mo na

xiedehlic

Answer:

1. Which of the following is the formula in finding the area of a semi-circle?

  • B.
  • A = 2πr/2

2. What is the radius of the semi-circle if the diameter is 100 mm?

  • A. 50mm
  • solution below.


Given :

  • Diameter is 100mm


to find :

  • the radius of semi-circle with diameter


Solution :

  • the half of diameter is equivalent to radius.
  • half of 100 is 50 mm


therefore,

  • the radius of the semi circle is 50mm.

3. What is the area of the semi-circle with a radius of 0.4 km?

  • D. 25.12 sq. km
  • solution below



Given :

  • radius of 0.4km


to find :

  • the area of semi-circle using radius


solution :

  • A = πr2
  • As = [tex]\frac{1}{2}[/tex]πr2
  • As = [tex]\frac{1}{2}[/tex]π(0.4)2
  • As =[tex]\frac{1}{2}[/tex] (3.14159)(0.4 squared =) (0.16)


According to the Question :

  • 0.16 x 3.14159 x 5 = 25.12 sq. km


therefore,

  • the area of semi-circle is 25.12 sq. km

4. Find the area of a semi-circle whose diameter is 50 cm?

  • A. 981.25 sq. cm


Given :

  • diameter of 50cm

to find :

  • the area of a semi-circle using diameter\

Solution :

  • D = 2r
  • R = [tex]\frac{1}{2}[/tex] of diameter
  • if diameter of the circle is 50, that means half of the circle is equivalent to radius
  • R = 25 cm
  • As = [tex]\frac{1}{2}[/tex]πr2
  • As = [tex]\frac{1}{2}[/tex] (3.14159) (25) 2

According to the Question :

  • As = 25 squared = 625 x 3.14159 x 0.5 = 981.25 sq. cm

therefore,

  • the area of semi-circle is 981.25 sq. cm

5. Marissa has a circular bed cover with a diameter of 5 m. If she is going to cut it in half, how many square meters will she have in each part.

  • B. 9.815 sq. m

Given :

  • diameter of 5 m


to find :

  • how many square meters will she have if she cut circular bed cover in half?

Solution :

  • Cut (semi-circle) area = (pi) 3.14159 x 2.5 (half of diameter) = 19.625 sq. m
  • 19.625 divided by 2 = 9.815 sq. m

therefore,

  • she will have 9.815 sq. m if she cut the circular bed cover.

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