Respuesta :

1. A = πr² — Circles

2. A = b • h — Parallelograms

3. A = 1/2 (b¹ + b²) • h — Trapezoids

4. A = 1/2 b • h — Triangles


Hope it helps!
1=Circle. 2=Triangle,3=Parallelogram 4=Trapezoid