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Q: What is the area and perimeter of a triangle 19cm x 21 cm?

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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)

If you're asking about a square with side length 21, the perimeter is 4 x 21 = 84 and the area is 212 = 441.

There is not enough information here to be able to answer this. Imagine a triangle with 2 sides, each of 10.49 inches, It would have almost no area compared with one with 3 sides of 7 inches each. Both triangles could have perimeters of 21 inches.

7 m x 3 sides = 21 m perimeter.

Area = 0.5*21*28 = 294 square inches

Related questions

21.20

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

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)

(6.06 x 3.5) = 21.20 sq in.

the answer is 32

21.2 sq inches.

Area of equilateral triangle: 0.5*7*7*sin(60 degrees) = 21.2 square inches

If you're asking about a square with side length 21, the perimeter is 4 x 21 = 84 and the area is 212 = 441.

7 cm x 3 sides = 21 cm perimeter.

7 cm x 3 sides = 21 cm perimeter.

There is not enough information here to be able to answer this. Imagine a triangle with 2 sides, each of 10.49 inches, It would have almost no area compared with one with 3 sides of 7 inches each. Both triangles could have perimeters of 21 inches.

7 m x 3 sides = 21 m perimeter.

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