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3 years ago

Find the surface area of the regular triangular pyramid

Mathematics

1 answer:

marishachu [46]3 years ago

5 0

A=8*(1/2*b*h)
A=8(1/2*2*18)
A=8*(18)
A=144

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(60 points to best answer) (asap please and thank you)

inna [77]

Answer: $83.\overline{3}\text{ feet}$

Step-by-step explanation:

Since, In the given diagram,

The sides of the triangles ABC and EDC are,

BC = 62 feet, DC = 93 feet and DE = 125 feet(given)

And, angles B and D are right angles,

⇒ $\angle ABC\cong \angle EDC$

$\text{Also, } \angle ACB\cong \angle ECD$ ( Vertically opposite angles )

By AA similarity postulate,

$\triangle ABC\sim \triangle EDC$

The sides of similar triangles are in same proportion ,

⇒ $\frac{AB}{ED}=\frac{BC}{DC}$

⇒ $AB \times DC = BC \times ED$

⇒ $AB = \frac{BC.ED}{DC}$

By substituting the values,

We get,

⇒ $AB = \frac{62\times 125}{93}$

⇒ $AB = \frac{7750}{93}=83.\overline{3}\text{ feet}$

3 0

4 years ago

For the following system, use the second equation to make a substitution for y in the first equation. 3x + y = 2 y + 4 = 3x

expeople1 [14]

First, set the second equation with y as the isolated variable. To do this, subtract 4 from both sides to get
$y = 3x - 4$
Now that you know the value of y, put that expression in for y in the first equation to get
$3x + (3x - 4) = 2$
Then, simplify by adding the x terms together to get
$6x - 4 = 2$
add 4 on both sides to isolate the x terms to get
$6x = 6$

then divide 6 from both sides to get
$x = 1$
Using that x value, plug it into one of the equations as x to find y ( I will use y=3x-4)
$y = 3(1) - 4 = 3 - 4 = - 1$
x=1 and y=-1 is the answer

5 0

3 years ago

What are the steps to(2x+3y)4

lilavasa [31]

(2x + 3y)4

Distribute

4*2x = 8x
4*3y = 12y

8x + 12y

Answer: 8x + 12y

8 0

4 years ago

Read 2 more answers

Help ASAP give brainest

Vera_Pavlovna [14]

Answer:

B,D