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Q: Can you find the area of a triangle when give the perimeter and 3 angles?

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If you know the lengths of 2 sides and the included angle then use: Area of a triangle = 1/2*a*b*sinC

You cannot. For a given area, an equilateral triangle will have the smallest perimeter but that perimeter can be increased - without limit - without increasing the area.

Depends on what information you have and what you require. If you have all three sides, there are different formulae to find the perimeter, angles and area. If you have two sides and an angle (depending on the angle) you have formulae for the remaining side and then perimeter and area. If you have a side and two angles there are formulae to find the missing sides and then perimeter and area. There are other possibilities: you have the altitude and require the area; etc.

I need to know more about the triangle, such as one or 2 of the angles, whether it is isosceles or equilateral, or whether the lengths share a certain ratio. For example, a triangle of sides 8,8 and 5 (perimeter of 21) will surely have a different area as compared to a triangle of sides 7,7 and 7 (perimeter of 21 as well)

Area of a triangle in square units = 0.5*base*height

to find the area of a triangle you divide the base of the triangle by two and multiply your answer by the height .so your formula would be 1/2b times h to find the perimeter of a triangle u simply just add the sides.

Knowing only the angles of a triangle does not provide enough information to determine its perimeter. You must know the length of at least one side.

Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place.

Area:A=1/2bhA=Area b=Base h=HeightPerimeter:P=a+b+cP=Perimeter a,b,c=side lengths of the triangle

The base is one third of the perimeter, half of the base times the height is the area.

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