Respuesta :

Acute (1st triangle on the left)

Obtuse

Right

Acute

Answer:

A) Acute

B) Obtuse

C) Right

D) Acute

Step-by-step explanation:

A) all angles less than 90, so acute

B) one angle more than 90, so obtuse

C) one angle 90, so right

D) all angles less than 90, so acute