Question

An equilateral triangle has a perimeter of 66 m and a height of 19.1 m. What is its area?
I'm so confused.

Answer 1

hmmm

Answer 2

Yeah I'm so confused and there aren't any directions

Answer 3

is there any options?

Answer 4

Nope :/

Answer 5

@EclipsedStar

Answer 6

I'm sooo lost

Answer 7

dude i feel u ill try to get someone to help u

Answer 8

Thanks :)

Answer 9

@geerky42 can u help?

Answer 10

"An equilateral triangle has a perimeter of 66 m"

So sum of all three sides is 66m.

So what is length of one side? WE can treat one side as base.

Answer 11

All sides of equilateral triangle are same, just so you know.

Answer 12

So it should be 66/3 and that will be one of the sides?

Answer 13

Right?

Answer 14

Okay so it should be 22, and then multiply that by 19.1 for the area?

Answer 15

And then the area= 420.2 right?

Answer 16

Actually \(A = \dfrac{1}{2}bh\)

So you should divide by 2.

Answer 17

22 multiply by 19.1 then divide by 2.

Answer 18

210.1?

Answer 19

Then that would be your final answer.

Answer 20

Yep

Answer 21

Does that make sense?

Answer 22

Yay! Thank you!

Answer 23

Do you think you could help with another if it isnt a bother?

Answer 24

Sure

Answer 25

Okay I need to find the area of this polygon:

Answer 26

I think I know how to do it but I'm not sure

Answer 27

I would ,like you to try it on your own.

Answer 28

Tell me answer and I will check

Answer 29

The triangle is half of the square, I believe, and the measurements of the triangle are a hypotenuse of 5 and a base of 3, multiply those and then multiply by two to get the whole square?

Answer 30

That "square" isn't really square. It's rectangle. And You would need to find height.

Focus on that right triangle part. Use pythagorean theorem to find height.

Answer 31

Kk. 3^2+b^2=5^2
9+b^2=25
25-9= 16
b=4

Answer 32

Correct, so height is 4 ft.

Now can you find area of triangle and rectangle?

Answer 33

24 for the rectangle
12 for the triangle

Answer 34

Don't forgot that in triangle, you need to divide base times height by 2.

Answer 35

so it'd be 6?

Answer 36

Yep

Answer 37

So what is total area?

Answer 38

12

Answer 39

or is it still 24?

Answer 40

For area of rectangle, you just multiply base by height and that it.

For triangle, you also need to divide by 2. Because basically triangle is half the rectangle.