Question

Q 20. If the perimeter of an equilateral triangle is 60 cm,
then what is its area?
a 200v2cm2
b. 100V2cm2
c. 100V3cm2
d. 200V3cm2
fb following angles can be constructed​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Given

perimeter =60 cm

semi perimeter =

2

60

=30 cm.

Therefore the length of each side.

a+a+a=60

⇒3a=60

⇒a=

3

60

⇒a=20

∴ Area =

s(s−a)(s−b)(s−c)

⇒ Area =

30(30−20)(30−20)(30−20)

⇒ Area =

30×10×10×10

⇒ Area =

3×10×10×10×10

⇒ Area =10×10

3

⇒ Area = 100

3

cm

2

∴ so, the answer is D. 100

3

cm

2