I need to find the surface area of this image.

17 cm

Step-by-step explanation:

Surface area is the sum of the areas of all faces (or surfaces) on a 3D shape. To find the surface area of a cuboid, add the areas of all faces. 12+2.5+2.5=17

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130