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2 years ago

12

Find the surface area of the regular pyramid. A triangular pyramid. The base triangle has a base of 9 yards and a height of 7.8

yards. The height of a triangular face is labeled 10 yards. find yd(2)

1 answer:

Anuta_ua [19.1K]2 years ago

4 0

Answer:

You would multiply 90x7.8 to get the answer.

Step-by-step explanation:

9x10=90.

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3 years ago

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PIT_PIT [208]

In the smaller triangle, let $y$ be the length of the smallest leg. Then the smallest leg in the larger triangle is $14-y$ .

Within the scope of the smaller triangle, we have $y$ such that

$x^2+y^2=13^2\implies y=\sqrt{13^2-x^2}$

Then within the larger the triangle, we would have

$x^2+(14-y)^2=15^2\iff x^2+\left(14-\sqrt{13^2-x^2}\right)^2=15^2$

Now we can solve for $x$ :

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