189k views
4 votes
Find the perimeter? how do you do this

Find the perimeter? how do you do this-example-1
User Choi
by
8.7k points

1 Answer

5 votes

Explanation:

to find the missing side length we need to use the invisible triangle that is kind of cut off in the top left corner.

it is a right-angled triangle, and the missing side is the Hypotenuse (baseline). therefore, we use Pythagoras.

now, can we get the invisible side lengths of this triangle ?

yes, because the complete figure including the invisible triangle is s perfect rectangle with 2 equal lengths and 2 equal widths.

so, the complete rectangle side on the left would also be 5. but we see only 2. so the invisible part is 5-2=3.

and the complete rectangle side in the top would also be 8. but we see only 4. so the invisible part is 8-4=4.

so, with Pythagoras,

unknown side² = 3² + 4² = 9 + 16 = 25.

unknown side = 5

and now the perimeter is

P = 2 + 8 + 5 + 4 + 5 = 24

User Hazem Essam
by
8.4k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories