Answer:
<u>Final </u><u>answer</u><u> </u><u>-</u>
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hope helpful :D
Step-by-step explanation:
A. Right
B. Acute
C. Right
D. Obtuse
ΔABC is an obtuse triangle
∠ ABC = ∠ABD + ∠ DBC = 60° + 40° = 100°
thus ∠ ABC = 100° is an obtuse angle
hence ΔABC is an obtuse triangle
Like what kinds? Finding out the type of angle? The degree?