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Alexus [3.1K]
3 years ago
13

I’m confused on this one

Mathematics
2 answers:
never [62]3 years ago
6 0
I think its 90 degrees. 
shusha [124]3 years ago
4 0
I like incenter problems but this one looks underdetermined.  Is there enough information to get anywhere?  We're given what, an isoscleles triangle perhaps, with a  common side of AC=BC=37?

The incenter is the center of the inscribed circle, which will be tangent to all the sides, so each radius to the points where the circle touches the triangle will be perpendicular to the side.  The three radii are concurrent, their meet the incenter, the center of the incircle, oddly called G here.  

(For the record, standard notation is centroid G, orthocenter H, circumcenter O, incenter I, Nine Point Center N.)

r=EG=FG=DG is the altitude of three triangles that make up the whole triangle.  If we call a=BC, b=AC, c=AB we have equal areas:

\frac 1 2 ar + \frac 1 2 b r + \frac 1 2 c r = \textrm{area ABC}

\frac r 2 (a+b+c) = \textrm{area ABC}

r = \dfrac{ \textrm{area ABC}}{\frac 1 2 (a+b+c)}

We can plug in Heron's formula for the area; the denominator is already the semiperimeter.

But that doesn't really get us anywhere as we only know one side, perhaps two if we assume the triangle is isosceles but not the third.



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pickupchik [31]

The solution to system is x = 0 and y = -1

<em><u>Solution:</u></em>

<em><u>Given system of equations are:</u></em>

-8x + 2y = -2 ----------- eqn 1

4x + 4y = -4 ---------- eqn 2

We have to solve the system of equations

We can solve the equations by elimination method

<em><u>Multiply eqn 2 by 2</u></em>

8x + 8y = -8 ------ eqn 3

<em><u>Add eqn 1 and eqn 3</u></em>

-8x + 2y = -2

8x + 8y = -8

( + ) ---------------

0x + 2y + 8y = -2 - 8

10y = -10

Divide both sides by 10

y = -1

<em><u>Substitute y = -1 in eqn 1</u></em>

-8x + 2(-1) = -2

-8x - 2 = -2

-8x = -2 + 2

x = 0

Thus the solution to system is x = 0 and y = -1

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3 years ago
together Xavier,Yolanda,and Zachary have $4.44 . if each person has the same amount , how much money does each person have?
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Answer:

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Find the area by adding the areas of the three triangles. The area of a right triangle is: A = ½bh

Two triangles are identical so you can just multiply the area of the first triangle by two: 2A1 = 2(½bh) = 2(½ab) = ab.

The total area of the trapezoid is : A1 + A2 = ab + ½c2

You multiply both sides by 2 to get rid of the ½: (a2 + 2ab + b2) = 2ab + c2

You subtract out the 2ab: a2 + b2 = c2.

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2 years ago
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