Question

Find the area of an equilateral triangle each of whose sides measures (1) 18 cm (11) 20 cm

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Answer 1

Answer:

54cm²

Step-by-step explanation:

side : 18 cm

area of a triangle: side × 3

: 18×3

: 54 cm ²

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Answer 2

140.13 cm² , 173cm²

✯ Case 1

➭ We know that sides of equilateral Δs are equal.

We will use here formula :-

area of equilateral triangle = √3/4 ×side²

_________________[Put Values]

Area = √3 * (18)²/4

⇒ Area = √3 * 324 / 4

⇒ Area = 1.73 * 324/4

⇒ Area = 140.13

⇒ Area = 140.13 cm²

 

✯ Case 2

➭ We know that sides of equilateral Δs are equal.

We will use here formula :-

Area of eq.triangle =√3/4 ×side²

_________________[Put Values]

Area = √3 * (20)²/4

⇒ Area = √3 * 400 / 4

⇒ Area = 1.73 * 400/4

⇒ Area = 173

⇒ Area = 173 cm²

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