2 years ago

If point A ( -3, -2) is reflected across the y-axis what is the coordinate of the image of A?

Mathematics

1 answer:

gayaneshka [121]2 years ago

6 0

2,-3 is the coordinate of A

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NNADVOKAT [17]

Answer:

$SA=234.8\ yd^2$

Step-by-step explanation:

we know that

The surface area of the regular pyramid is equal to the area of the triangular base plus the area of its three triangular lateral faces

step 1

Find the area of the triangular base

we know that

The triangular base is an equilateral triangle

The area applying the law of sines is equal to

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step 2

Find the area of its three triangular lateral faces

$A=3[\frac{1}{2}bh]$

we have

$b=14\ yd$

Find the height of triangles

Applying the Pythagorean Theorem

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$100=49+h^2$

$h^2=100-49$

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substitute

$A=3[\frac{1}{2}(14)\sqrt{51}]$

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step 3

Find the surface area

Adds the areas

$SA=84.87+149.97=234.84\ yd^2$

Round to the nearest tenth

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The answer would be A. 3.6 × 10^9

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