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Tasya [4]
3 years ago
15

What expression represents the area of a circle with a radius of 7 units

Mathematics
1 answer:
Gwar [14]3 years ago
4 0

Answer:

The area of the circle is 153.86 u²

And the expression is

a = π * (7 u)²

Step-by-step explanation:

To solve this problem we need to use the area formula of a circle:

a = area

r = radius = 7 units

π = 3.14

a = π * r²

we replace with the known values

a = π * (7 u)²

a = 3.14 * 49 u²

a = 153.86 u²

The area of the circle is 153.86 u²

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There are 2 way to solve this.

one using Pythagoras theorem and 2nd using trigonometry

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using Pythagoras theorem we know

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36 + x^2 = 144

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x = √(108) = √( 2×2×3×3×3)

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bow lets use trigonometry

we know
sin theta = perpendicular / hypotanes
sin 60 = x /12
x = 12 × sin 60
we kNow sin 60 = √3/ 2
so
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Murrr4er [49]

Answer:

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Step-by-step explanation:

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