4) ΔTPH = ΔP₁T₁H₁. TH = ____, TP = ____, HP = ____; ∠THP = ∠____, ∠PTH = ∠____, ∠TPH = ∠____.

По записи треугольников T ↔ P₁, P ↔ T₁, H ↔ H₁.

TH = P₁H₁; TP = P₁T₁; HP = T₁H₁.

∠THP = ∠P₁H₁T₁; ∠PTH = ∠T₁P₁H₁; ∠TPH = ∠P₁T₁H₁.