Question

7- what is perimeter of triangle? (3mark​

Answer 1

Answer:

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Answer 2

Perimeter of a Triangle

• A perimeter of a shape is the length of its boundary or the total length around the shape. The perimeter of a 2D closed shape = sum of all its side.

⚘ Perimeter of a triangle

• The perimeter of a triangle is the sum of all its three sides. We can work out the perimeter using the following formula:

• Perimeter of a triangle = sum of all three sides

Example 1: Find the perimeter of the given triangle.

Here, sides of the triangle are AB = 3 cm, BC = 4 cm and AC = 3 cm

• Perimeter of triangle = sum of all three sides.

Therefore, the perimeter of the given triangle = 3 cm + 4 cm + 3 cm = 10 cm

✿ Perimeter of an isosceles triangle:

Perimeter of an isosceles triangle = a + b + c

• Here sides AB and AC are equal length so we can write the above formula as given below.

Perimeter of an isosceles triangle = a + a + c or b + b + c

• This can also be written as 2a + c or 2b + c or 2✕ equal side + c.

✿ Perimeter of an equilateral triangle:

Perimeter of an equilateral triangle = a + b + c

• As we know sides of an equilateral are equal in length.

So, the perimeter of an equilateral triangle = a + a + a= 3a

This formula can also be written as:

• Perimeter of an equilateral triangle= 3 ✕ side.

★ Fun Fact:

• The word perimeter is made up of two Greek words – “peri” which means around and “metron” which means measure.

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