find the value of triangle.

Answer:
8
Step-by-step explanation:
[tex]\frac{8}{10}[/tex] = Δ / 10
Multiply both the sides by 10 to remove the denominator, 10 in the right of the equation.
[tex]\frac{8}{10}[/tex] × 10 = Δ / 10 × 10
Δ = [tex]\frac{8}{10}[/tex] × 10
The '10' can be cut off.
Δ = 8