# What is the formula for perimeter and area of a triangle?

## What is the formula for perimeter and area of a triangle?

Since all the three sides of the triangle are of equal length, we can find the perimeter by multiplying the length of each side by 3. 20 + 20 + 20 = 3 × 20 = 60 cm. Thus, the perimeter of an equilateral triangle is 3 times the length of each side. Area of a two-dimensional shape is the space occupied by the shape.

## What is a formula of area of rectangle?

A = l × b. The area of any rectangle is calculated, once its length and width are known. By multiplying length and breadth, the rectangle’s area will obtain in a square-units dimension.

## How do you figure out area and perimeter?

Divide the perimeter by 4: that gives you the length of one side. Then square that length: that gives you the area. In this example, 14 ÷ 4 = 3.5.

## What is the formula for finding the area of a rectangle?

Area is measured in square units such as square inches, square feet or square meters. To find the area of a rectangle, multiply the length by the width. The formula is: A = L * W where A is the area, L is the length, W is the width, and * means multiply.

## What is the area of the rectangle ABCD?

Answer. Answer: Area of the rectangle ABCD is 40 sq. cm.

## What is the formula for finding the third side of a triangle?

To use the Law of Sines to find a third side:

- Identify angle C. It is the angle whose measure you know.
- Identify a and b as the sides that are not across from angle C.
- Substitute the values into the Law of Cosines.
- Solve the equation for the missing side.

## What is the smallest perimeter for a rectangle with an area of 16?

Since there is no rule that states a rectangle cannot have all sides of equal length, all squares are rectangles, but not rectangles are squares. Hence, the minimum perimeter is 16 in with equal sides of 4 in.

## What is area and perimeter in math?

About Transcript. Perimeter is the distance around the outside of a shape. Area measures the space inside a shape.

## How do you find the perimeter and area of an isosceles triangle?

Use a similar formula, Perimeter = 2A + B, to find the perimeter of the isosceles triangle, where A and B are the length of the legs and base. Solve for area just as you would any other triangle using the formula Area = 1/2 B x H, where B is the base and H is the height.

## What is the sum of all 3 sides of a triangle?

No matter how you position the three sides of the triangle, the total degrees of all interior angles (the three angles inside the triangle) is always 180°. This property of a triangle’s interior angles is simply a specific example of the general rule for any polygon’s interior angles.

## How do we calculate area?

For a square or rectangular room, you will first need to measure the length and then the width of the room. Then multiply the length and width. Length x Width = Area. So, if your room measures 11 feet wide x 15 feet long, your total area will be 165 square feet.

## What does perimeter mean in math?

About Transcript. Perimeter is the distance around the outside of a shape. Area measures the space inside a shape. Learn how to calculate perimeter and area for various shapes.

## How do you find the perimeter of different shapes?

Multiply the length of one side of a regular polygon by the number of sides to find its perimeter. Regular polygons have identically sized sides. For example, if the shape is a regular pentagon, which has 5 sides, with a side length of 4 inches, then multiplying 4 inches by 5 results in a perimeter of 20 inches.

## How do you find the length of the third side of a triangle given two sides?

You can use the Pythagorean Theorem to find the length of the hypotenuse of a right triangle if you know the length of the triangle’s other two sides, called the legs. Put another way, if you know the lengths of a and b, you can find c.

## What is the perimeter of ABC?

To find the perimeter of \triangle ABC we use the Pythagorean Theorem which tells us that |AB|^2 = |AC|^2 + |BC|^2. Since |AC| = 5 and |BC| = 12 we find that |AB| = \sqrt{169} = 13. The perimeter of \triangle ABC is then 5 + 12 + 13 = 30 units.

## What is a perimeter in math?

Perimeter is the distance around the edge of a shape. Learn how to find the perimeter by adding up the side lengths of various shapes.

## What is the formula for perimeter?

Perimeter, Area, and Volume

Table 1 . Perimeter Formulas | ||
---|---|---|

Shape | Formula | Variables |

Square | P=4s | s is the length of the side of the square. |

Rectangle | P=2L+2W | L and W are the lengths of the rectangle’s sides (length and width). |

Triangle | a+b+c | a,b , and c are the side lengths. |

## What is the formula for perimeter of a isosceles triangle?

To calculate the perimeter of an isosceles triangle, the expression 2s + b is used, where s represents the length of the two congruent sides and b represents the length of the base.

## How do I find the perimeter and area of a rectangle?

The perimeter P of a rectangle is given by the formula, P=2l+2w , where l is the length and w is the width of the rectangle. The area A of a rectangle is given by the formula, A=lw , where l is the length and w is the width.

## How do I find the measure of an angle in a triangle?

If we add all three angles in any triangle we get 180 degrees. So, the measure of angle A + angle B + angle C = 180 degrees. This is true for any triangle in the world of geometry. We can use this idea to find the measure of angle(s) where the degree measure is missing or not given.

## How do you find the area of a rectangle with different sides?

To find the area of a rectangle, multiply its width by its height. If we know two sides of the rectangle that are different lengths, then we have both the height and the width.