Square + Triangle - Part 1

Geometry Level 1

The above figure consists of a square and a triangle. The side lengths of the figure are 4 and 7, as marked.

What is the perimeter of the figure?

21 19 20 22

1 solution

Paola Ramírez
Jun 10, 2015

Perimeter of the exterior sides from the square: $4 \times 3=12$

Perimeter of the exterior sides fron the triangle : $5*+3=8$

Perimeter is $\boxed{8+12=20}$

$*$ By phytagorean theorem triangle's hypotenuse is $\sqrt{4^2+3^2}=5$