Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [triangles]

For questions about properties and applications of triangles.

A triangle is a polygon with three sides. It is an important geometric figure, because any polygon can be subdivided into triangles.

Triangles can be classified by the number of sides they have that have equal length

  • All three sides of an equilateral triangle have equal length.
  • An isosceles triangle has at least two sides of equal length.
  • A scalene triangle is a triangle that is not isosceles, that is, it has no sides with equal length.

A triangle may also be classified by describing its angles. A triangle is said to be a right triangle if it contains a right angle, and obtuse triangle if it contains an obtuse angle, or an acute triangle if all three of its angles are acute.

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Minimum Value of Triangle

The sides of a triangle are equal to integral numbers of units. Two of the sides are 4 and 6 units long respectively; what is the minimum value for the triangle's perimeter?
Brianna Marie
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Solve triangle from angle, adjacent site and area

I feel like this should be possible, since I got the angle and the length of one side, the only thing that could vary would be the other adjacent site. However, since I also know the area, it seems to me that only one length of the unknown adjacent…
Zackline
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If in Triangle ABC, $\angle C=60°$, then prove that $\frac{1}{a+c} + \frac{1}{b+c} = \frac{3}{a+b+c}$

How to solve this $\frac{1}{a+c} + \frac{1}{b+c} = \frac{3}{a+b+c}$. Given that $\angle C=60°$. Please answer as soon as possible. Tomorrow is my test
Muhammad Ali Zafar
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Triangle angle question

I need help about a triangle angle question.
blackcat52
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Orthocentre of a triangle

I just want to know what the orthocentre of a triangle is? How do you define it? It appears in a past paper so i just need the definition. Thanks!
Jayne
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geometry perimeter for triangles

I don't get.. The largest side of the triangle (side a) is 10 more units that the smallest side (side b) and the 3rd side of the triangle(side c) is triple the smallest side of the triangle. if the perimeter is 125 units how many units is each…
Minezap90
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Triangle and parallel lines

L1 and l2 are parallel how can I find the angle of x , y , z ?
KF2
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To find perpendicular of right angled triangle

If given slope of hypotenuse and length of base, how can we find length of perpendicular ?
Sophie Clad
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Find area of triangle ABC

BD Perpendicular AC , AB =BC=a Find the area of triangle ABC I have tried Googling , I used formula 1/2 (base X Height) . Used Pythagorean theorem. Anyone can suggest me solution.
SSK
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Calculating the legs of a right angle triangle

Given- right angle triangle which is divided by its height, forming two triangles. The aria of one is S II=30.533(cm^2) c(hypotenuse)=65 (cm) The legs of the triangle need to be calculated. diagram of the triangle
Idk123
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Find the sides of a right triangle given the area and perimeter

I was sure that this has been asked before, but the title did not match. So if the area of a right triangle is A and the perimeter is P, express the sides a and b in terms of A and P.
marty cohen
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Can I draw a triangle with only two measures given?

I want to know whether I can draw a triangle with only two measures given. The base length should be 6 and an angle from the base should be 45°. Is it possible? Help me out ? Thanks in advance.
Adhil Jahan
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what is the length of this triangle?

if sides a and b are 100m, and there is a right angle, then how long is side c?. By the way, I made it on paint quickly. >--triangle link<-- I AM ONLY A 6TH GRADER SO PLEASE DO NOT PUT THINGS LIKE "Pythagorean theorem" AND "100√2" BECAUSE I WILL NOT…
Awesome Gamer 333
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solving right angled triangles and isosceles triangle:

I need help in these 2 questions please!! 1) Triangle XYZ is right angled at Y. If XY=7.2cm and YZ=5.4cm, calculate XZ. 2) The diagonal PR of a rectangle PQRS is 37cm. If PQ=35cm, find the side QR.
cheyenne
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In the figure given below, angle pqr equals angle qrs equals angle tur equals 90 degrees. Pq equals 8 sr equals 12 and ur equals 6. Find tu

(https://i.stack.imgur.com/fU02a.jpg) In the figure given below, angle pqr equals angle qrs equals angle tur equals 90 degrees. Pq equals 8 sr equals 12 and ur equals 6. Find tu
Techievent.in
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