Consider the congruence statement
δsun≅δfog.
identify the congruent sides.
identify the congruent angles.

The congruent sides are:

SU ≅ FO , UN ≅ OG , SN ≅ FG  

- The congruent angles are:

m∠S ≅ m∠F , m∠U ≅ m∠O , m∠N ≅ m∠G

Step-by-step explanation:

* Lets revise the cases of congruence  

- SSS  ⇒ 3 sides in the 1st Δ ≅ 3 sides in the 2nd Δ  

- SAS ⇒ 2 sides and including angle in the 1st Δ ≅ 2 sides and  

 including angle in the 2nd Δ  

- ASA ⇒ 2 angles and the side whose joining them in the 1st Δ

 ≅ 2 angles and the side whose joining them in the 2nd Δ

- AAS ⇒ 2 angles and one side in the first triangle ≅ 2 angles  

 and one side in the 2ndΔ  

- HL ⇒ hypotenuse leg of the first right angle triangle ≅ hypotenuse

 leg of the 2nd right angle Δ

* From all cases above when the two triangles are congruent, then

 the corresponding sides are equal and the corresponding angles

 are equal

∵ ΔSUN ≅ ΔFOG

- The corresponding sides are:

# SU and FO

# UN and OG

# SN and FG

- The corresponding angles are:

# ∠S and ∠F

# ∠U and ∠O

# NS and ∠G

- The congruent sides are:

∴ SU ≅ FO

∴ UN ≅ OG

∴ SN ≅ FG  

- The congruent angles are:

∴ m∠S ≅ m∠F

∴ m∠U ≅ m∠O

∴ m∠N ≅ m∠G

i belive those are the ones that are under 90 degreese.

12.5 feet

step-by-step explanation: