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dedylja [7]
3 years ago
14

What is the area of a triangle length 2.5 height 8.75

Mathematics
2 answers:
gregori [183]3 years ago
3 0
Area of a triangle = 0.5 x base x height
                            = 0.5 x 2.5 x 8.75
                            = 10.94 (units squared) 
bekas [8.4K]3 years ago
3 0
My Geometry teacher used to say, 

"My students, ahh. Textbooks. They say, 'My pretty little students, here's a formula! I will give you numbers and you plug it in.' Then he would say, 'I don't like textbooks. I'm a rebel! So, I derive the formula.'" 

He made us derive it. But the formula is this: 1/2 x b x h. Why? The real formula is because two equal triangles are both HALF of a PARALLELOGRAM. 

Parallelogram area formula is b x h, or base x height. So half of that? 
(b x h) / 2, or 1/2 x b x h.

Plug this in. 

Assuming your triangle is equilateral, I plug in 2.5 for the base and 8.75 for the height. 

So, what's 1/2 x 2.5 x 8.75?

It's 10.9375.

Rounded, it's 10.94.

You have it.

Just remember, it's about WHY this formula works.
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bekas [8.4K]

Answer:75

Step-by-step explanation:

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5 0
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Find the value of y . <br> Please help !
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Answer:

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Step-by-step explanation:

The right triangles in this geometry are all similar, so the ratio of long side to short side is the same:

  y/5 = 11/y

  y² = 55 . . . . . . multiply by 5y

  y = √55 . . . . . take the square root

__

And x=4√5 by looking at ratios of short side to hypotenuse.

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A and B are complementary angles. The measure of A is twice the measure of B. HELPPPpP ME PLEASE and THANK YOU!!!
vladimir2022 [97]

Answer:

A = 60

B = 30

Step-by-step explanation:

Complementary angles add to 90 degrees

A = 2B            A is twice the measure of B

A + B =90    Complementary angles add to 90 degrees

Substitute the first equation in for the second

A+B =90

2B+B=90

Combine like terms

3B = 90

Divide by 3

3B/3 = 90/3

B = 30

A = 2B

A = 2*30

A = 60


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3 years ago
How many different triangles can be constructed with side lengths 5 inches, 7inches, and 15 inches?
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